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Income Taxes Income from continuing operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Foreign Earnings Repatriated $ 24,000    
Income (Loss) from Continuing Operations before Income Taxes, Domestic 59,872 $ 80,714 $ 74,288
Income (Loss) from Continuing Operations before Income Taxes, Foreign $ (8,589) $ 4,450 $ (4,589)