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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Current $ 21,548 $ 25,790 $ 24,439
Deferred (1,554) 825 1,172
Total $ 19,994 $ 26,615 $ 25,611