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Investments in Real Estate and Real Estate Under Construction - Summary of development arrangements outstanding (Details) - Jun. 30, 2015 ft² in Thousands, $ in Thousands | USD ($) ft²
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Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | ft² | 2,483
Expected Maximum Commitment/Contribution | $ 368,922
Oak Creek Wisconsin [Member] | Industrial property [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | ft² | 164
Expected Maximum Commitment/Contribution | $ 22,609
Lease Term (Years) | 20 years
Richmond, Virginia [Member] | Office Building [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | ft² | 330
Expected Maximum Commitment/Contribution | $ 110,137
Lease Term (Years) | 15 years
Anderson, South Carolina [Member] | Industrial property [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | ft² | 1,325
Expected Maximum Commitment/Contribution | $ 70,012
Lease Term (Years) | 20 years
Lake Jackson, Texas [Member] | Office Building [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | ft² | 664
Expected Maximum Commitment/Contribution | $ 166,164
Lease Term (Years) | 20 years

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