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Employee Benefit Plans | 12 Months Ended
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Dec. 31, 2011
Employee Benefit Plans [Abstract] |
Employee Benefit Plans | Note 7. Employee Benefit Plans Defined Contribution Plan Substantially all employees meeting certain service requirements are eligible to participate in our 401(k) employee retirement plan. Employee contributions are limited to a percentage of their compensation, as defined in the plan. We make contributions based upon the greater of a percentage of employee contributions or ten percent of net income. Company contributions for 2011, 2010 and 2009 were $13.9 million, $7.6 million and $4.8 million, respectively. Deferred Compensation Plan We maintain a nonqualified deferred compensation plan for the benefit of certain eligible employees whose contributions to the 401(k) employee retirement plan are limited due to provisions of the Internal Revenue Code. Participating employees may elect to defer receipt of a percentage of their compensation, as defined in the plan, and the deferred amount is credited to each participant's deferred compensation account. The plan is not funded and the Company does not make a matching contribution to this plan. Although the plan is not funded, each participant is allowed to select one or more investments from the available options. Participant accounts are adjusted at the end of each fiscal quarter to reflect the performance of the selected investment options in which the participants' accounts are deemed invested. The amounts owed to the participants totaled $24.6 million and $22.3 million at December 31, 2011 and 2010, respectively.

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