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RELATED PARTY TRANSACTIONS (Details) (USD $) |  |  | 12 Months Ended |  |  | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Lead Trustee [Member] | Dec. 31, 2011 Lead Trustee [Member] | Dec. 31, 2010 Lead Trustee [Member] | Dec. 31, 2012 Unconsolidated Affiliates [Member] | Dec. 31, 2011 Unconsolidated Affiliates [Member] | Dec. 31, 2012 Core Portfolio [Member] Brandywine Portfolio [Member] | Dec. 31, 2011 Core Portfolio [Member] Brandywine Portfolio [Member] | Dec. 31, 2010 Core Portfolio [Member] Brandywine Portfolio [Member] | Feb. 28, 2010 Restricted Stock [Member] Klaff [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Units issued for interest in contractual rights (in shares) |  |  |  |  |  |  |  |  |  |  | 250,000
Units issued for interest in contractual rights, converted (in shares) |  |  |  |  |  |  |  |  |  |  | 250,000
Related party revenue |  |  |  |  |  |  |  | $ 800,000 | $ 1,300,000 | $ 800,000 |
Receivable from related parties | 210,000 | 1,375,000 |  |  |  | 210,000 | 1,376,000 |  |  |  |
Related party transaction expense |  |  | $ 100,000 | $ 100,000 | $ 100,000 |  |  |  |  |  |

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