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Retirement And Savings Plan (Details) (USD $)
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12 Months Ended | 15 Months Ended | 33 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Mar. 31, 2010
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Dec. 31, 2012
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| Compensation and Retirement Disclosure [Abstract] | |||||
| Percentage of employee contribution | 50.00% | ||||
| Contribution by employer, per dollar | $ 0.10 | $ 0.25 | |||
| Percentage of plan participant's deferrals | 6.00% | 6.00% | |||
| Matching contribution by employer | $ 2,000,000 | $ 1,900,000 | $ 1,300,000 | ||
| X | ||||||||||
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- Definition
Contributions To Retirement Plan By Employer No definition available.
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| X | ||||||||||
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- Definition
Employee Contribution Of Pretax Dollars to Retirement Plan Percentage No definition available.
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| X | ||||||||||
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- Definition
Employer Contribution Per Dollar No definition available.
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| X | ||||||||||
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- Definition
Percentage of plan participant's deferrals No definition available.
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| X | ||||||||||
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- Details
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