Retirement Plan	12 Months Ended
Dec. 31, 2011
Retirement Plan [Abstract]
Retirement Plan	8. RETIREMENT PLAN The Company has a defined contribution savings plan, which qualifies as a deferred salary arrangement under Section 401(k) of the Internal Revenue Code, or IRC. The 401(k) Plan is for the benefit of all employees and permits voluntary contributions by employees up to 100% of their annual pretax compensation limited by the Internal Revenue Service, or the IRS, imposed maximum contribution. The Company matches 100% of the first 3% of employee contributions and 50% of the next 2% of employee contributions. The Company's contributions and the employee contributions are fully vested when contributed. The plan assets are held in trust and invested as directed by the plan participants. Employer matching contributions to the plan were $0.6 million, $0.5 million and $0.4 million for the years ended December 31, 2011, 2010 and 2009, respectively.

- Definition

Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented.

+ References+ Details