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Income Taxes (Details 4) (USD $)
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12 Months Ended | |
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Dec. 31, 2011
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Dec. 31, 2010
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| Summary of activities related to unrecognized tax benefits | ||
| Balance at the beginning of the period | $ 17,868,000 | $ 15,444,000 |
| Additions to tax positions related to the current year | 2,961,000 | 2,424,000 |
| Additions to tax positions related to prior years | 490,000 | 0 |
| Subtractions to tax positions related to prior years | (6,425,000) | 0 |
| Balance at the end of the period | 14,894,000 | 17,868,000 |
| Unrecognized tax benefits that, if recognized, would reduce annual effective tax rate | 14,600,000 | 17,300,000 |
| Accrued interest related to unrecognized tax benefits | 500,000 | |
| Expected increase in unrecognized tax benefits during next fiscal year | $ 3,000,000 | |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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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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| X | ||||||||||
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- Definition
The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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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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| X | ||||||||||
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- Definition
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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