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Employee Benefit Plans | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Employee Benefit Plans | Note 6. 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 the employee’s compensation, as defined in the plan. We match a percentage of our employees’ contributions up to certain maximum limits. In addition, we may also provide a discretionary matching contribution as specified in the plan. Our employer contributions, net of forfeitures, for 2017, 2016 and 2015 were $35.9 million, $28.9 million and $30.3 million, respectively. Deferred Compensation Plan We maintain a nonqualified deferred compensation plan for the benefit of certain eligible employees, including those 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, participants are allowed to select investment options for which their deferrals and future earnings are deemed to be invested. Participant accounts are adjusted to reflect participant deferrals and the performance of their deemed investments. The amounts owed to the participants totaled $61.5 million and $53.8 million at December 31, 2017 and 2016, respectively, of which $59.5 million and $51.0 million were included in "Other non-current liabilities" on our Balance Sheets as of December 31, 2017 and 2016, respectively.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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