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Defined Contribution and 401(k) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Defined Contribution and 401(k) (Textual) [Abstract]
Total contribution by employees	$ 0.4	$ 0.3	$ 1.1	$ 0.7
Total plan expenses	$ 0.4	$ 0.2	$ 1.0	$ 0.6
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%

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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