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Share-Based Compensation - Nonvested Share Awards - Time Based (Details) - Nonvested Share Awards - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost (in dollars) $ 19.7  
Granted 323,497 331,733
Market value of stock awarded granted in connection with acquisition $ 17.7 $ 15.3
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 4 years