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Share-Based Compensation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Summary of share-based compensation expense    
Share-based compensation before income tax benefit $ 1,819 $ 1,217
Income tax benefit (654) (436)
Total share-based compensation, net of income tax benefit 1,165 781
Performance unit incentive plan (PUP) [Member]
   
Summary of share-based compensation expense    
Share-based compensation before income tax benefit 863 238
Restricted stock and performance based restricted stock [Member]
   
Summary of share-based compensation expense    
Share-based compensation before income tax benefit 773 747
Stock options [Member]
   
Summary of share-based compensation expense    
Share-based compensation before income tax benefit 95 145
Restricted stock units and performance based restricted stock units [Member]
   
Summary of share-based compensation expense    
Share-based compensation before income tax benefit $ 88 $ 87