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Stock-Based Compensation - Stock-Based Compensation Expense and Related Tax Benefit (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Noncash Expense [Abstract]      
Stock options $ 1,944 $ 1,770 $ 3,675
Restricted stock units 22,285 24,560 26,859
Unrestricted stock awards 824 630 729
Phantom stock units 3,720 3,301 2,165
Total stock-based compensation 28,773 30,261 33,428
Related tax benefit $ 5,086 $ 5,390 $ 6,019