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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plan	Employee Benefit Plan The Company maintains a 401(k) savings plan covering substantially all of its employees. Eligible employees may contribute up to 60% of their annual salary through payroll deductions, but not more than the statutory limits set by the Internal Revenue Service. The Company matches employee contributions at the discretion of the Board. During 2012, 2011 and 2010, the Company’s matching contributions totaled $5.2 million, $4.0 million and $2.8 million, respectively.

The entire disclosure for pension and other postretirement benefits.

+ References

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