INCOME TAXES (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
INCOME TAXES
Income taxes at statutory rate	$ 137,547	$ 115,550	$ 135,069
Less: Income taxes at statutory rate on Partnership income not subject to income taxes	(139,107)	(116,260)	(135,204)
Increase/(decrease) resulting from:
State taxes, net of federal income tax	(192)	(83)	(7)
Valuation allowance of deferred tax assets	3,483
Other	(334)	(289)	(288)
Income tax expense (benefit)	$ 1,397	$ (1,082)	$ (430)