Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Anti-dilutive shares) (Details)

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Summary of Significant Accounting Policies (Anti-dilutive shares) (Details)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Weighted Average Number Diluted Shares Outstanding Adjustment 91 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 735 1,611
Options [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 50 91
Stock-settled stock appreciation rights (SARs) [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 314 591
Restricted stock/units [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 91 649
Performance contingent SARs [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 280 280