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Share-Based Compensation - Effect of Recording Share-Based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Share-based compensation expense [1] $ 12,062 $ 11,223 $ 7,879
Income tax benefit 3,365 4,601 3,152
Share-based compensation expense, net of tax 8,697 6,622 4,727
Unrecognized compensation expense $ 13,982 $ 13,266 $ 9,990
Weighted-average amortization period remaining (in years) 1 year 2 months 13 days 1 year 3 months 10 days 1 year 4 months
[1] Comprised of restricted stock, restricted stock unit, and performance share awards expense.