Income Tax (Pre-tax Income Foreign and Domestic) (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 Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Domestic									$ 758,496	$ 493,328	$ 768,857
Income (Loss) from Continuing Operations before Income Taxes, Foreign									285,450	251,467	239,676
Income before income taxes	$ 295,543	$ 287,600	$ 353,223	$ 107,580	$ 206,743	$ 140,137	$ 213,790	$ 184,125	$ 1,043,946	$ 744,795	$ 1,008,533