v2.4.0.6

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Statement of Financial Position [Abstract] |  |
Allowance for doubtful accounts | $ 2,248 | $ 2,147
Common units outstanding | 77,886,078 | 70,756,078

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