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Income Taxes (Details) (USD $)	3 Months Ended
Income Taxes (Details) (USD $)	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Income Taxes [Abstract]
Recognized income tax provision	$ 15,776,000	$ 14,439,000
Income tax reconciliation audit settlement		5,900,000
Effective tax rate of discrete adjustments	38.60%	37.30%
Income tax receivables	$ 9,200,000		$ 4,800,000

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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