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Members' Equity (Narratives) (Details) (USD $)
0 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Sep. 15, 2008
Jun. 22, 2006
Sep. 27, 2005
Wells Management
Class of Stock [Line Items]          
Proceeds from contributed capital         $ 1,000,000
Shares subscribed but unissued (in shares)       10,000  
Member shares issued (in shares) 51,854 51,854 51,854