Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Tax at statutory federal rate	$ 22,361	$ 21,399
Partnership earnings not subject to tax	(32,768)	(12,183)
State and local tax, net of federal benefit	10,735	524
Other income tax	1,784	(1,677)
Income Tax Expense (Benefit)	$ 2,112	$ 8,063