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Share Based Compensation, 401(k) Plan and Deferred Compensation (401 (k) Plan) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Maximum annual contribution per employee, percent | 100.00% |  |
Employers matching contribution, vesting period | 3 years |  |
Employer discretionary contribution amount | $ 0.4 | $ 0.3 | $ 0.2

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- Definition Defined Contribution Plan, Employer Discretionary Contribution Amount + References No definition available. + Details
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- Details
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