Income Taxes - Computed Amount and Differences in Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Pretax income	$ 368,512	$ 392,345	$ 392,440
Computed amount at statutory rate of 35%	128,979	137,321	137,354
State and local income tax (net of federal tax benefit)	4,070	5,033	4,875
Taxes on non-U.S. earnings-net of foreign tax credits	(6,666)	(11,663)	(9,378)
Effect of flow-through entities	(8,735)	(8,358)	(9,018)
U.S. business tax credits	(1,665)	(1,273)	(1,680)
Domestic activities production deduction	(9,043)	(6,521)	(7,489)
Deferred tax effect of foreign tax rate change	0	(2,636)	0
Capital loss on divestitures	(23,444)	0	0
Valuation allowance	17,973	0	0
Share-based payments	(6,520)	0	0
Other	2,454	(2,365)	(1,610)
Total provision for income taxes	$ 97,403	$ 109,538	$ 113,054