Defined Contribution and 401(k) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011 OptionPlan	Dec. 31, 2010	Dec. 31, 2009
Defined Contribution and 401 (k) (Textual) [Abstract]
Total contribution by employees	$ 1.5	$ 1.0	$ 0.7
Total plan expenses	1.4	0.9	0.5
Plan expenses charged to operations	$ 1.4	$ 0.7	$ 0.3
Number of options available to employees to invest in different funds	12
Retirement Savings Plan Under Section 401 (k) [Member]
Additional Defined Contribution and 401(k) (Textual) [Abstract]
Percentage of maximum limit for employees to contribute their cash compensation	100.00%
Percentage of employers matching contribution	100.00%
Percentage of employee contribution	3.00%
Percentage of employee compensation plus matching contribution	50.00%
Percentage of additional employee contribution	2.00%

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Number of options available to employees to invest in different funds.

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Percentage of additional employee contribution.

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Percentage of employee compensation plus matching contribution.

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Percentage of employee contribution.

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No definition available.

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Percentage of employers matching contribution.

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- Definition

Percentage Of Maximum Limit For Employees To Contribute Their Cash Compensation Under Plan.

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

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The amount of the cost recognized during the period for defined contribution plans.

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The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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