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Income Taxes Schedule of Income Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
United States $ 57,989 $ 88,748 $ 88,681
International 32,725 26,321 (3,117)
Income before income taxes $ 90,714 $ 115,069 $ 85,564