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Income Taxes, Consolidated Income Before Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Consolidated Income Before Provision for Income Taxes [Abstract]      
U.S. $ (19,119) $ 134,473 $ 184,476
Foreign 231,958 77,486 114,031
Income before provision for income taxes $ 212,839 $ 211,959 $ 298,507