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Segments (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Total assets	$ 9,625,253	$ 9,064,082
Domestic [Member]
Segment Reporting Information [Line Items]
Total assets	7,253,279	6,852,148
Foreign [Member]
Segment Reporting Information [Line Items]
Total assets	$ 2,371,974	$ 2,211,934

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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