MEMBERS' EQUITY Table 3 (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Our cash distributions applicable to the period in which the distributions were earned
Cash distributions per unit	$ 0.495		$ 0.46	$ 0.975	$ 0.91
Total cash distributions	$ 21,059	$ 20,422	$ 19,556	$ 41,481	$ 38,688

Common stock cash dividend declared by an entity during the period. This element includes paid and unpaid dividends declared during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration