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Real Estate - Portfolio (Remaining Funding Commitments) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 properties
Real Estate Investments, Net [Abstract] |  |
Number of Properties with Funding Commitments | 54 |
Total Commitment | $ 164,420 | [1]
Amount Funded | 127,235 |
Remaining Commitment | $ 37,185 |
[1] | Includes land, construction costs and tenant improvements.

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- Details
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