Income Taxes (Provision for Income Taxes Components) (Details 2) - 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 [Abstract]
U.S. Federal, Current									$ 56,342	$ 5,728	$ 215,450
State and Local, Current									6,325	402	23,737
Non-U.S.									8,463	2,441	10,485
Total income tax, Current									71,130	8,571	249,672
U.S. Federal, Deferred									33,959	20,890	38,684
State and Local, Deferred									(5,164)	(10,749)	27,257
Non-U.S.									(18,725)	1,788	(3,313)
Total income tax, Deferred									10,070	11,929	62,628
U.S. Federal, Total									90,301	26,618	254,134
State and Local, Total									1,161	(10,347)	50,994
Non-U.S.									(10,262)	4,229	7,172
Total provision for income tax	$ 27,200	$ 7,800	$ 23,800	$ 22,400	$ 30,500	$ (30,500)	$ 19,600	$ 900	$ 81,200	$ 20,500	$ 312,300