Employee Benefits	12 Months Ended
Employee Benefits	Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract]
Employee Benefits	Note 12. Employee Benefits Employee Savings Plan We sponsor a qualified 401(k) defined contribution plan that covers substantially all of our employees. Participating employees may elect to contribute, on a tax-deferred basis, up to 80% of their pre-tax annual compensation (subject to a maximum permissible contribution under Section 401(k) of the Internal Revenue Code). Matching contributions by us are 50% of the first 6% of base compensation that the participant contributes, and additional amounts may be contributed at the discretion of the Board of Directors. Participants may elect to invest their contributions in various funds including: equity, fixed income, stable value, and balanced -lifecycle funds. Employer contributions (net of forfeitures) made to the plan during the years ended December 31, 2016, 2015 and 2014 were approximately $9.6 million, $9.0 million and $8.5 million, respectively. Non-qualified Deferred Compensation Plan We sponsor a non-qualified deferred compensation plan, under which certain members of management and other highly compensated employees may elect to defer receipt of a portion of their annual compensation, subject to maximum and minimum percentage limitations. The amount of compensation deferred under the plan is credited to each participant’s deferral account and a non-qualified deferred compensation plan obligation is established by us. An amount equal to each participant’s compensation deferral is transferred into a rabbi trust and invested in various debt and equity securities as directed by the participants. The assets of the rabbi trust are held by the Company and recorded as “Assets of deferred compensation plan” in the accompanying Consolidated Balance Sheets. Assets of the non- qualified deferred compensation plan consist primarily of investments in mutual funds, money market funds and equity securities. The values of these investments are based on published market prices at the end of the period. Adjustments to the fair value of these investments are recorded in “Other income, net,” offset by the same adjustments to compensation expense (recorded as “Operating expenses” or “G&A expenses” in the accompanying Consolidated Statements of Comprehensive Income). We recorded a gain of $5.3 million for the year ended December 31, 2016, a loss of $0.7 million for the year ended December 31, 2015 and a gain of $3.7 million for the year ended December 31, 2014 related to these investments. These investments are specifically designated as available to the Company solely for the purpose of paying benefits under the non-qualified deferred compensation plan. However, the investments in the rabbi trusts would be available to all unsecured general creditors in the event that we become insolvent. Deferred compensation plan obligations represent amounts due to plan participants and consist of accumulated participant deferrals and changes in fair value of investments thereon since the inception of the plan, net of withdrawals. This liability is an unsecured general obligation of the Company and is recorded as “Deferred compensation plan obligations” in the accompanying Consolidated Balance Sheets. The assets and liabilities related to the non-qualified deferred compensation plan at December 31, 2016 and 2015 were $69.9 million and $64.2 million, respectively.