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Income Taxes, Consolidated Income Before Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Consolidated Income Before Provision for Income Taxes [Abstract]      
U.S. $ 1,135 $ (19,119) $ 134,473
Foreign 264,432 231,958 77,486
Income before provision for income taxes $ 265,567 $ 212,839 $ 211,959