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Benefit Plans	12 Months Ended
Benefit Plans	Dec. 31, 2012
Benefit Plans
Benefit Plans	4. Benefit Plans The Company has a defined contribution retirement plan (the "401(k) Plan"). Employee participants can elect to contribute up to 75 percent of their compensation, subject to Internal Revenue Service ("IRS") deferral limitations. The Company makes contributions to the 401(k) Plan based on employee compensation and contributions. The Company matches 50 percent of each employee's contribution up to 6 percent of their annual compensation. The Company recognized $5.6 million, $5.8 million and $6.3 million of expense for the years ended December 31, 2010, 2011 and 2012, respectively, for matching contributions to the 401(k) Plan.

The entire disclosure for pension and other postretirement benefits.

+ References

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