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Share-Based Compensation - Summary of Share-Based Compensation Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Summary of share-based compensation expense        
Share-based compensation before income tax benefit $ 1,025 $ 59 $ 3,131 $ 1,562
Income tax benefit (381) (17) (1,180) (587)
Share-based compensation, net of income tax benefit 644 42 1,951 975
Restricted stock        
Summary of share-based compensation expense        
Share-based compensation before income tax benefit 523 653 1,623 2,066
Performance unit incentive plan (“PUP”)        
Summary of share-based compensation expense        
Share-based compensation before income tax benefit 456 (600) 1,444 (505)
Restricted stock units        
Summary of share-based compensation expense        
Share-based compensation before income tax benefit $ 46 $ 6 $ 64 $ 1