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Income Taxes (Income before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Pretax income in The Netherlands $ 20,695 $ 1,310 $ (4,931)
Pretax income from foreign operations 36,213 134,993 124,320
Income before income taxes $ 56,908 $ 136,303 $ 119,389