Income Taxes (Effective Income Tax Rate Reconciliation) (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 Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal statutory provision									$ 86,229	$ 213,789	$ 150,920
State and local income taxes									9,208	17,769	(1,379)
Other impact of foreign operations									(13,806)	(6,492)	(12,668)
Tax incentives/credits/exempt income									(10,735)	(12,130)	(19,232)
Release of other tax uncertainties									0	0	(5,856)
Outside basis differences									0	(27,110)	0
Goodwill impairments									58,022	0	0
Other, net									2,901	3,952	1,030
Total provision for income taxes	$ 38,204	$ 23,197	$ 33,394	$ 37,024	$ 44,204	$ 42,676	$ 52,351	$ 50,547	$ 131,819	$ 189,778	$ 112,815