Income Taxes, Current and Deferred Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current [Abstract]
Federal	$ 0	$ (14,358)	$ 0
State	652	1,814	(718)
Foreign	116,303	104,688	70,652
Current income tax expense (benefit)	116,955	92,144	69,934
Deferred [Abstract]
Federal	(17,836)	45,593	(27,171)
State	(1,974)	(2,273)	1,104
Foreign	634	666	25,886
Deferred income tax expense (benefit)	(19,176)	43,986	(181)
Provision for income taxes	$ 97,779	$ 136,130	$ 69,753