MEMBERS' EQUITY Table 1 (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Changes to our members’ equity
Balance as of December 31, 2010			$ 541,463
Net income	18,362	17,777	50,606	57,156
Distributions to unitholders	(21,059)		(61,903)	(57,182)
Other comprehensive loss			(24,843)
Unit-based compensation			1,150
Balance as of September 30, 2011	$ 506,473		$ 506,473