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Income Taxes (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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| Summary of Provision for Income Taxes | ||||
| Provision for income taxes | $ 28,291,000 | $ 38,942,000 | $ 129,754,000 | $ 122,667,000 |
| Gross Unrecognized Tax Benefits Reconcilement [Line Items] | ||||
| Unrecognized Tax Benefits, Ending Balance | 6,200,000 | 6,200,000 | ||
| Provision (benefit) for income taxes reconcilement | ||||
| Provision for income taxes | 28,291,000 | 38,942,000 | 129,754,000 | 122,667,000 |
| Income Taxes Textuals [Abstract] | ||||
| Total interest accrued on the unrecognized tax benefits | $ 2,200,000 | $ 2,200,000 | ||
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- Definition
The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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