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Share-Based Compensation - Effect of Recording Share-Based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement [Abstract]      
Share-based compensation expense $ 14,740 $ 13,183 $ 12,062
Income tax benefit 3,936 3,678 3,365
Share-based compensation expense, net of tax 10,804 9,505 8,697
Unrecognized compensation expense $ 12,656 $ 14,299 $ 13,982
Weighted-average amortization period remaining (in years) 1 year 3 months 18 days 1 year 1 month 6 days 1 year 2 months 12 days