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Share-Based Compensation - Summary of Share-Based Compensation Expenses (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Summary of share-based compensation expense        
Share-based compensation before income tax benefit $ 1,112 $ 548 $ 1,503 $ 2,367
Income tax benefit (417) (230) (569) (903)
Total share-based compensation, net of income tax benefit 695 318 934 1,464
Restricted stock/performance-based restricted stock (PBRS)
       
Summary of share-based compensation expense        
Share-based compensation before income tax benefit 759 947 1,413 1,720
Performance unit incentive plan (PUP)
       
Summary of share-based compensation expense        
Share-based compensation before income tax benefit 326 (339) 95 524
Restricted Stock Units and Performance Based Restricted Stock Units
       
Summary of share-based compensation expense        
Share-based compensation before income tax benefit 27 (66) (5) 101
Stock options
       
Summary of share-based compensation expense        
Share-based compensation before income tax benefit $ 0 $ 6 $ 0 $ 22