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Consolidated Balance Sheets (Parenthetical)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Consolidated Balance Sheets   
Class A limited partners, units authorized7,5007,5007,500
Class A limited partners, units issued7,5007,5007,500
Class A limited partners, units outstanding7,5007,5007,500