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Share-Based Compensation - Effect of Recording Share-Based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement [Abstract]      
Share-based compensation expense [1] $ 13,183 $ 12,062 $ 11,223
Income tax benefit 3,678 3,365 4,601
Share-based compensation expense, net of tax 9,505 8,697 6,622
Unrecognized compensation expense $ 14,299 $ 13,982 $ 13,266
Weighted-average amortization period remaining (in years) 1 year 1 month 6 days 1 year 2 months 12 days 1 year 3 months 18 days
[1] Comprised of restricted stock, restricted stock unit, and performance share awards expense.