Income Taxes (Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current income taxes: U.S. federal	$ 117,602	$ 100,826	$ 84,686
Current income taxes: State and local	11,175	13,686	9,774
Current income taxes: Foreign	31,981	41,151	46,450
Total current income taxes	160,758	155,663	140,910
Deferred income taxes: U.S. federal	4,165	31,052	5,280
Deferred income taxes: State and local	(3,983)	(3,473)	(5,720)
Deferred income taxes: Foreign	(29,065)	(51,605)	(62,085)
Total deferred income taxes	(28,883)	(24,026)	(62,525)
Income tax expense (benefit)	$ 131,875	$ 131,637	$ 78,385