Real Estate (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Industrial operating portfolio
Improved land	$ 4,813,145	$ 2,527,972
Buildings and improvements	16,739,403	8,186,827
Development portfolio, including cost of land	860,531	365,362
Land	1,984,233	1,533,611
Other real estate investments	390,225	265,869
Total investments in real estate properties	24,787,537	12,879,641
Less accumulated depreciation	2,157,907	1,595,678
Net investments in real estate properties	$ 22,629,630	$ 11,283,963

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The current amount of expenditures for a real estate project that has not yet been completed.

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Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

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Carrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale.

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Carrying amount of land available for development.

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The cumulative amount of depreciation for real estate property held for investment purposes.

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Represents a total which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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The net book value of real estate property held for investment purposes.

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Amount of real estate owned for income production and capital accretion potential, not otherwise specified in the existing taxonomy. Such real estate excludes that which is occupied or used in the business, for entertainment purposes, or held in inventory for specific purposes.

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