Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current tax provision:
Federal	$ (22,176)	$ 54,245	$ 54,315
State	(10,234)	(7,601)	5,790
Foreign	133,146	88,436	60,571
Total current	100,736	135,080	120,676
Deferred tax provision:
Federal	(37,396)	(153,963)	(24,383)
State	(52,391)	(52,695)	(14,080)
Foreign	4,267	(2,030)	(8,384)
Total deferred	(85,520)	(208,688)	(46,847)
Provision for (benefit from) income taxes	$ 15,216	$ (73,608)	$ 73,829