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Share-Based Compensation - Nonvested Share Awards - Time Based (Details) - Nonvested Share Awards - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost (in dollars) $ 29.7  
Granted 322,926 326,678
Market value of stock awarded granted in connection with acquisition $ 17.6 $ 15.0
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 4 years