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Share-based Compensation - Summary of Nonvested Share Grants (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of the status of non vested share grants [Roll Forward]      
Beginning balance nonvested 1,697 1,667 2,280
Granted 573 670 646
Vested (770) (573) (1,213)
Forfeited   (67) (46)
Forfeited and other 88    
Ending balance nonvested 1,588 1,697 1,667
Weighted-Average Grant-Date Fair Value [Roll Forward]      
Beginning balance nonvested $ 31.71 $ 26.68 $ 22.24
Granted 48.83 38.15 32.06
Vested 27.78 24.90 21.39
Forfeited   30.44 24.72
Forfeited and other 38.31    
Ending balance nonvested $ 39.30 $ 31.71 $ 26.68
Aggregate Intrinsic Value      
Vested $ 37,620    
Balance nonvested $ 111,947