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Condensed Consolidated Balance Sheets (Parenthetical)
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
General Partners' Capital Account, Units Outstanding 40,141,197 39,721,461 38,544,218
Limited Partners' Capital Account, Units Outstanding 1,707,660 1,731,672 1,784,208
Temporary Equity, Shares Outstanding 78,154 72,786