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Share-Based Compensation - Restricted Stock Unit and Award Activity (Details)
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Restricted Stock Units  
Number of Units/Awards  
Beginning balance (in shares) | shares 576,490
Granted (in shares) | shares 368,197
Converted into shares of common stock (in shares) | shares (118,481)
Forfeited/expired (in shares) | shares (12,832)
Ending balance (in shares) | shares 813,374
Weighted-average grant-date fair value  
Beginning balance (dollars per share) | $ / shares $ 49.35
Granted (dollars per share) | $ / shares 45.03
Converted into shares of common stock (dollars per share) | $ / shares 38.27
Forfeited/expired (dollars per share) | $ / shares 50.35
Ending balance (dollars per share) | $ / shares $ 48.99
Restricted Stock Awards  
Number of Units/Awards  
Beginning balance (in shares) | shares 40,852
Vested (in shares) | shares (40,852)
Ending balance (in shares) | shares 0
Weighted-average grant-date fair value  
Beginning balance (dollars per share) | $ / shares $ 46.23
Vested (dollars per share) | $ / shares 46.23
Ending balance (dollars per share) | $ / shares $ 0.00