Income Taxes (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Recognized income tax provision	$ 22,897,000	$ 16,022,000		$ 38,673,000	$ 30,461,000
Tax Adjustments, Settlements, and Unusual Provisions	4,200,000			2,500,000	5,300,000
Income tax reconciliation audit settlement	2,500,000		5,900,000
Effective tax rate of discrete adjustments	38.90%	37.70%		38.80%	37.60%
Income tax receivables	$ 12,100,000			$ 12,100,000		$ 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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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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- Definition

Reflects the effects of adjustments of previously recorded tax expense, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, IRS tax settlement and unusual repatriation of foreign earnings.

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