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Investments in Real Estate and Real Estate Under Construction Summary of development arrangements outstanding (Details) (USD $) | 6 Months Ended
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Jun. 30, 2013 sqft
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Square feet of property | 1,163,000 |
Expected Maximum Commitment/Contribution | $ 98,600,000 |
Rantoul Illinois [Member] | Industrial Property [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Square feet of property | 813,000 |
Expected Maximum Commitment/Contribution | 42,600,000 |
Lease Term (Years) | 20 years |
Bingen, Washington [Member] | Industrial Property [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Square feet of property | 124,000 |
Expected Maximum Commitment/Contribution | 18,900,000 |
Lease Term (Years) | 12 years |
Las Vegas, Nevada [Member] | Industrial Property [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Square feet of property | 180,000 | [1]
Expected Maximum Commitment/Contribution | 29,600,000 | [1]
Lease Term (Years) | 20 years | [1]
Costs incurred related to development arrangement | 1,191,000 |
Albany, Georgia [Member] | Retail Property [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Square feet of property | 46,000 |
Expected Maximum Commitment/Contribution | $ 7,500,000 |
Lease Term (Years) | 15 years |
[1] | At June 30, 2013, the Company's commitment could have been terminated by the Company due to an outstanding contingency, thus costs incurred through June 30, 2013 of $1,191 are recognized as pre-development costs and included in “Other assets” in the accompanying unaudited condensed consolidated balance sheet. Subsequent to June 30, 2013, the termination right expired.

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