Members' Capital and Distributions (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2011
Quarterly distributions in kind
Issue Date	Aug. 11, 2011	May 12, 2011	Feb. 11, 2011	Nov. 11, 2010
Series A preferred units [Member]
Quarterly distributions in kind
Issuance of preferred of units (paid-in-kind), units	278,026	271,245	264,629	258,175	536,000
Amount	$ 8,077,000	$ 7,880,000	$ 7,688,000	$ 7,500,000