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Investments in Real Estate and Real Estate Under Construction Summary of development arrangements outstanding (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2014 sqft
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | 1,366,000
Expected Maximum Commitment/Contribution | $ 309,155
Oak Creek Wisconsin [Member] | Industrial property [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | 164,000
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 | 330,000
Expected Maximum Commitment/Contribution | 110,137
Lease Term (Years) | 15 years
Lake Jackson, Texas [Member] | Office and R and D Property [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | 664,000
Expected Maximum Commitment/Contribution | 166,164
Lease Term (Years) | 20 years
Thomson, Georgia [Member] | Industrial property [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | 208,000
Expected Maximum Commitment/Contribution | $ 10,245
Lease Term (Years) | 15 years

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