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Investments in Real Estate and Real Estate Under Construction Summary of development arrangements outstanding (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 sqft
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | 1,247,000
Expected Maximum Commitment/Contribution ($ millions) | $ 313.3
Bingen, Washington [Member] | Industrial Property [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | 124,000
Expected Maximum Commitment/Contribution ($ millions) | 18.9
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 | 180,000
Expected Maximum Commitment/Contribution ($ millions) | 29.6
Lease Term (Years) | 20 years
Richmond, Virginia [Member] | Office Property [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | 279,000
Expected Maximum Commitment/Contribution ($ millions) | 98.6
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 ($ millions) | $ 166.2
Lease Term (Years) | 20 years

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