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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2010
Consolidated Statements of Comprehensive Income [Abstract]
Gain on divestiture of discontinued operations	$ 55,904,000
Divestiture of discontinued operations, net of income tax	$ 9,700,000

Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

Amount of tax expense or benefit on gain (loss), not previously recognized, resulting from the sale of a business component.