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Stock-Based Compensation (Stock Incentive Plan Narrative) (Details) (USD $)
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12 Months Ended |
3 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Mar. 31, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |
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1,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term |
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10 years
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |
925,410us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
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| Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |
$ 4.33us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |
3 years 6 months
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3 years 6 months
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| Stock or Unit Option Plan Expense |
$ 727,000us-gaap_StockOptionPlanExpense
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$ 454,000us-gaap_StockOptionPlanExpense
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |
$ 3.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised |
13,183us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
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| Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price |
$ 0.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term |
3 years 3 months 26 days
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| Stock Appreciation Rights (SARs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |
$ 1.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
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$ 1.97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
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| Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price |
$ 5.90us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
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| SAR and Restricted Stock [Member] |
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| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |
$ 2,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= pdii_SARandRestrictedStockMember
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term |
1 year 7 months 10 days
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| Chief Executive Officer [Member] | Performance base shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
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188,165us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= pdii_PerformanceBaseSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
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| Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |
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$ 5.10us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= pdii_PerformanceBaseSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |
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5 years
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |
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$ 1.87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= pdii_PerformanceBaseSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
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| Chief Executive Officer [Member] | Performance Shares [Member] |
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| Performance Shares Target Premium |
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50.00%pdii_PerformanceSharesTargetPremium
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
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| Performance Shares Final Tranche [Domain] | Chief Executive Officer [Member] | Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
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87,209us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementEquityComponentsAxis
= pdii_PerformanceSharesFinalTrancheDomain
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
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| Average stock price, performance shares |
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$ 15.30pdii_Averagestockpriceperformanceshares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementEquityComponentsAxis
= pdii_PerformanceSharesFinalTrancheDomain
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |
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5 years
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| Performance Shares Second Tranche [Domain] | Chief Executive Officer [Member] | Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
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64,460us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementEquityComponentsAxis
= pdii_PerformanceSharesSecondTrancheDomain
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
|
| Average stock price, performance shares |
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$ 10.20pdii_Averagestockpriceperformanceshares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementEquityComponentsAxis
= pdii_PerformanceSharesSecondTrancheDomain
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
|
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |
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5 years
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| Performance Shares First Tranche [Domain] | Chief Executive Officer [Member] | Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
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36,496us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementEquityComponentsAxis
= pdii_PerformanceSharesFirstTrancheDomain
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
|
| Average stock price, performance shares |
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$ 7.65pdii_Averagestockpriceperformanceshares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementEquityComponentsAxis
= pdii_PerformanceSharesFirstTrancheDomain
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
|