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Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Segment Total Assets [Line Items]
Total assets	$ 38,344,323	$ 31,633,973
US Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	24,620,708	17,965,559
Canada Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	3,605,798	3,347,771
Europe And South Africa Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	2,148,457	1,846,751
Asia Pacific Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	3,000,018	2,902,101
Corporate And Other Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	$ 4,969,342	$ 5,571,791

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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