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Stock-Based Compensation - Stock-Based Compensation Expense and Related Tax Benefit (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement, Noncash Expense [Abstract]      
Stock options $ 1,770 $ 3,675 $ 2,695
Restricted stock units 24,560 26,859 17,738
Unrestricted stock awards 630 729 974
Phantom stock units 3,301 2,165 1,747
Total stock-based compensation 30,261 33,428 23,154
Related tax benefit $ 5,390 $ 6,019 $ 5,034