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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
	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

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Defined Contribution Plan, Employers Matching Contribution, Vesting Service Period

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Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent

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