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Investment in Unconsolidated Ventures (Financial Position of Unconsolidated Real Estate Ventures) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Schedule of Equity Method Investments [Line Items] |  |  |  |
Company's share of equity (Company's Basis) | $ 186,042 |  | $ 180,512 |
Austin Joint Venture [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Company's share of equity (Company's Basis) | (1,200) |  |  |
Unconsolidated Real Estate Ventures [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net property | 1,081,064 |  | 965,475 |
Other assets | 153,348 |  | 164,152 |
Other liabilities | 68,031 |  | 49,442 |
Debt | 792,919 |  | 699,860 |
Equity | 373,462 |  | 380,325 |
Company's share of equity (Company's Basis) | $ 186,042 | [1] | $ 180,512 | [1]
[1] | (a) This amount includes the effect of the basis difference between the Company's historical cost basis and the basis recorded at the Real Estate Venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from the impairment of investments, purchases of third party interests in existing Real Estate Ventures and upon the transfer of assets that were previously owned by the Company into a Real Estate Venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the Real Estate Venture level.

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