Income Taxes Income Taxes Details 3 (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]
Computed tax provision at the applicable federal statutory income tax rate									$ 114,331	$ 129,623	$ 140,910
State and local taxes, net of federal income tax benefits									13,279	10,542	25,736
Foreign jurisdiction differences									(2,557)	(5,183)	(4,424)
Permanent differences associated with dispositions									9,267	2,909	61,892
Changes in uncertain tax positions									5,669	4,046	4,624
Foreign Valuation Allowance, Amount									15,850	0	0
Other									(6,486)	(6,910)	(2,758)
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
Total effective tax rate									45.70%	36.50%	56.10%