Income Taxes, Current and Deferred Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current [Abstract]
Federal	$ 0	$ 6,328	$ 37,402
State	(718)	1,483	2,095
Foreign	70,652	50,403	48,904
Current income tax expense (benefit)	69,934	58,214	88,401
Deferred [Abstract]
Federal	(27,171)	16,556	(380)
State	1,104	(674)	444
Foreign	25,886	4,817	20,866
Deferred income tax expense (benefit)	(181)	20,699	20,930
Provision for income taxes	$ 69,753	$ 78,913	$ 109,331