Income Taxes Income Taxes Details 2 (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Current: United States									$ 113,629	$ 94,502	$ 67,511
Current: Foreign									12,084	9,270	10,859
Current: State									16,150	13,207	17,939
Total current income taxes									141,863	116,979	96,309
Deferred: United States									(19,496)	15,918	108,514
Deferred: Foreign									22,708	(878)	(653)
Deferred: State									4,278	3,008	21,810
Provision for deferred income taxes									7,490	18,048	129,671
Provision for income taxes	$ (72,872)	$ (27,422)	$ (16,746)	$ (32,313)	$ (41,249)	$ (26,118)	$ (31,007)	$ (36,653)	149,353	135,027	225,980
Income Taxes Paid									115,000	105,400	106,300
Proceeds from Income Tax Refunds									$ 2,400	$ 1,900	$ 600