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Investments in Variable Interest Entities (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Joint venture assets and liabilities
Assets	$ 8,621,979	$ 8,092,493
Liabilities	2,565,785	2,643,050
Corporate Joint Venture [Member]
Joint venture assets and liabilities
Assets	193,600	159,200
Liabilities	$ 74,600	$ 63,300

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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