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Share-Based Compensation (Details) - Effect of Recording Share-Based Compensation Expense - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Share-based compensation expense [1] $ 7,879 $ 7,242 $ 5,926
Income tax benefit 3,152 2,962 2,424
Share-based compensation expense, net of tax 4,727 4,280 3,502
Unrecognized compensation expense $ 9,990 $ 8,644 $ 6,937
Weighted-average amortization period remaining (in years) 1 year 4 months 1 year 4 months 7 days 1 year 3 months 18 days
[1] Comprised of restricted stock, restricted stock unit, and performance share awards expense.