MEMBERS' EQUITY Table 2 (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Our cash distributions applicable to the period in which the distributions were earned
Cash distributions per unit	$ 0.510	$ 0.495	$ 1.020	$ 0.975
Total cash distributions	$ 21,713	$ 21,059	$ 43,433	$ 41,481