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Share-Based Compensation - Summary of Share-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Summary of share-based compensation expense    
Share-based compensation before income tax benefit $ 1,999 $ 1,066
Income tax benefit (744) (398)
Share-based compensation, net of income tax benefit 1,255 668
Performance unit incentive plan (“PUP”)    
Summary of share-based compensation expense    
Share-based compensation before income tax benefit 1,316 535
Restricted stock    
Summary of share-based compensation expense    
Share-based compensation before income tax benefit 623 498
Restricted stock units    
Summary of share-based compensation expense    
Share-based compensation before income tax benefit $ 60 $ 33