Income Taxes (Components of the Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ (19,461)	$ 374,602	$ 18,832
Foreign	70,146	56,526	52,978
State	16,259	3,075	7,759
Total current	66,944	434,203	79,569
Deferred:
Federal	1,899	52,842	(7,688)
Foreign	(14,804)	(5,468)	(3,139)
State	(251)	46,784	(10,827)
Total deferred	(13,156)	94,158	(21,654)
Total provision	$ 53,788	$ 528,361	$ 57,915