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Schedule I (Parentheticals) (Details) | Dec. 31, 2013 | Dec. 31, 2012
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Limited partners: Depositary units issued | 115,900,309 | 104,850,813
Limited partners: Depositary units outstanding | 115,900,309 | 104,850,813
Parent Company [Member] |  |
Limited partners: Depositary units issued | 115,900,309 | 104,850,813
Limited partners: Depositary units outstanding | 115,900,309 | 104,850,813

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