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Impact Of ASC Topic 810 On Accounting For Whitehall Group (Details) (USD $)			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Whitehall Group [Member]	Dec. 31, 2010 Accounting Standard Codification 810 [Member] Whitehall Group [Member]	Dec. 31, 2009 Accounting Standard Codification 810 [Member] Whitehall Group [Member]
Schedule Of Impact Of Accounting Standard Committee On Subsidiary [Line Items]
Net assets decrease	$ (2,072,529,000)	$ (3,396,182,000)			$ 108,000,000
Liabilities decrease					85,000,000
Non-controlling interest decrease					$ 23,000,000
Accounting treatment changed from consolidation to the equity method of accounting, voting interest percentage			49.00%
Ownership percentage of the company	10.00%	80.00%		80.00%

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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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest).

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