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Share-Based Compensation (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Summary of share-based compensation expense        
Share-based compensation before income tax benefit $ 1,670,000 $ 991,000 $ 4,524,000 $ 3,284,000
Income tax benefit (571,000) (358,000) (1,606,000) (1,163,000)
Total share-based compensation, net of income tax benefit 1,099,000 633,000 2,918,000 2,121,000
Restricted stock/performance-based restricted stock (PBRS) [Member]
       
Summary of share-based compensation expense        
Share-based compensation before income tax benefit 890,000 794,000 2,610,000 2,409,000
Performance unit incentive plan (PUP) [Member]
       
Summary of share-based compensation expense        
Share-based compensation before income tax benefit 548,000 86,000 1,220,000 345,000
Stock options [Member]
       
Summary of share-based compensation expense        
Share-based compensation before income tax benefit 148,000 146,000 450,000 476,000
Restricted Stock Units and Performance Based Restricted Stock Units [Member]
       
Summary of share-based compensation expense        
Share-based compensation before income tax benefit $ 84,000 $ (35,000) $ 244,000 $ 54,000