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Income Taxes , Unrecognized Tax Benefits (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Income Tax Disclosure [Abstract] | |||
| Unrecognized tax benefits that would favoraby affect effective tax rate | $ 29,200,000 | ||
| Accrued interest and penalties related to uncertain tax benefits | 1,000,000 | 1,500,000 | 600,000 |
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | |||
| Unrecognized tax benefits, beginning of year | 27,808,000 | 19,269,000 | 12,083,000 |
| Gross increases for tax positions related to the current year | 4,713,000 | 7,550,000 | 9,049,000 |
| Gross increases for tax positions related to the prior year | 405,000 | 1,479,000 | 0 |
| Gross decreases for tax positions related to the prior year | (3,322,000) | (490,000) | (1,863,000) |
| Unrecognized tax benefits, end of year | 29,604,000 | 27,808,000 | 19,269,000 |
| Liability for uncertain tax positions | $ 30,200,000 | $ 28,800,000 | $ 19,100,000 |
| X | ||||||||||
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- Details
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- Definition
The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. 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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