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Employee Savings and Retirement Plan (Notes)
12 Months Ended
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]  
Employee Savings and Retirement Plan
Employee Savings and Retirement Plan

The Company's 401(k) plan allows eligible employees to contribute up to 30% of their salary, subject to annual limits. The Company matches a portion of the employee contributions and may, at its discretion, make additional contributions based upon earnings. The Company's contributions were approximately $5.3 million, $5.6 million, and $5.4 million for the years ended December 31, 2012, 2011 and 2010, respectively.