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Income Taxes, Current and Deferred Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current [Abstract]      
Federal $ (14,358) $ 0 $ 6,328
State 1,814 (718) 1,483
Foreign 104,688 70,652 50,403
Current income tax expense (benefit) 92,144 69,934 58,214
Deferred [Abstract]      
Federal 45,593 (27,171) 16,556
State (2,273) 1,104 (674)
Foreign 666 25,886 4,817
Deferred income tax expense (benefit) 43,986 (181) 20,699
Provision for income taxes $ 136,130 $ 69,753 $ 78,913