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Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
Income Taxes (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Tax Contingency [Line Items]
Additional Valuation Allowance Adjustment	$ 5,400,000
Valuation Allowance, Deferred Tax Asset, Change in Amount	7,200,000		12,600,000
Provision for income taxes	$ 25,116,000	$ 20,974,000	$ 67,487,000	$ 59,277,000

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

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.