Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Restricted Stock and Units) (Details)

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Stock-Based Compensation (Restricted Stock and Units) (Details) (USD $)
 12 Months Ended 16 Months Ended 20 Months Ended 39 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Apr. 26, 2014
Sep. 05, 2013
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Nonvested at beginning of the year, Shares 606,138   553,097 606,138 606,138
Granted, Shares 214,210        
Vested, Shares (151,091)        
Forfeited, Shares (116,160)        
Nonvested at end of the year, Shares 553,097 606,138      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Nonvested at beginning of the year, Weighted-Average Grant Date Fair Value $ 7.04   $ 7.60 $ 7.04 $ 7.04
Granted, Weighted-Average Grant Date Fair Value $ 7.07        
Vested, Weighted-Average Grant Date Fair Value $ 5.53 $ 5.21      
Forfeited, Weighted-Average Grant Date Fair Value $ 7.39        
Nonvested at end of the year, Weighted-Average Grant Date Fair Value $ 7.60 $ 7.04      
Nonvested, Average Remaining Vesting Period     1 year 4 months 26 days 1 year 8 months 5 days  
Granted, Average Remaining Vesting Period         2 years 2 months 10 days
Nonvested at beginning of the period, Aggregate Intrinsic Value $ 3,891,000   $ 4,204,000 $ 3,891,000 $ 3,891,000
Granted, Aggregate Instrinsic Value $ 1,628,000        
Aggregate fair value of restricted stock and restricted stock units vested $ 800,000 $ 800,000