Income Taxes Income Taxes Details 2 (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Current: United States									$ 18,138	$ 154,128	$ 113,629
Current: Foreign									10,541	12,187	12,084
Current: State									6,974	4,934	16,150
Total current income taxes									35,653	171,249	141,863
Deferred: United States									(48,565)	(314,389)	(19,496)
Deferred: Foreign									386	618	22,708
Deferred: State									6,700	(4,067)	4,278
Provision for deferred income taxes									(41,479)	(317,838)	7,490
Provision for income taxes	$ 67,224	$ (17,043)	$ (16,034)	$ (28,321)	$ 113,759	$ (10,437)	$ (32,956)	$ 76,223	(5,826)	(146,589)	149,353
Income Taxes Paid									65,400	170,200	115,000
Proceeds from Income Tax Refunds									$ 11,400	$ 3,400	$ 2,400