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Share-Based Payments - Summary of Grants, Exchanges and Forfeitures of Restricted Stock and RSUs (Details) - LTIP - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Grant Date Fair Value $ 20,483 $ 19,148 $ 17,496
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 65,697 105,561 150,110
Grant (in shares) 27,245 28,070 27,700
Vested (in shares) (67,586) (67,934) (72,249)
Forfeitures (in shares) 0 0 0
Outstanding, ending balance (in shares) 25,356 65,697 105,561
RSU      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 1,852,957 1,632,746 1,703,775
Grant (in shares) 1,069,202 1,006,800 912,916
Vested (in shares) (877,261) (739,388) (938,541)
Forfeitures (in shares) (37,543) (47,201) (45,404)
Outstanding, ending balance (in shares) 2,007,355 1,852,957 1,632,746