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Share-Based Compensation - Nonvested Share Awards - Time Based (Details) - Nonvested Share Awards - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 4 years  
Unrecognized compensation cost $ 27.0  
Granted 282,860 269,311
Market value of stock awarded granted in connection with acquisition $ 15.4 $ 12.0