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Executive Deferred Compensation Plan | 12 Months Ended
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Dec. 31, 2017
Executive Deferred Compensation Plan [Abstract] |
Executive Deferred Compensation Plan | 17. Executive Deferred Compensation Plan The Company has an executive deferred compensation plan for select management personnel. Under this plan, the Company may make a contribution of up to 10% of a participant's salary. In addition, each participant has the option to defer a portion of their compensation up to a maximum of 80% of their base salary and 100% of their bonuses. Participant contributions are immediately vested. Company contributions vest 50% after ten years of service and 5% each year of service thereafter. In addition, any unvested company contributions will fully vest on the earlier of: (a) the participant attaining 60 years of age; and (b) death or disability. The Company recorded compensation expense of $2.3 million, $1.5 million and $1.5 million for the years ended December 31, 2015, 2016 and 2017, respectively, related to its contributions to the plan. The total long-term deferred compensation liability under the deferred compensation plan was $36.7 million and $43.2 million for the years ended December 31, 2016 and 2017, respectively, related to its contributions to the plan and is included in other long-term liabilities. All benefits under the deferred compensation plan are unsecured obligations of the Company. The Company has contributed assets to a "rabbi trust" for the payment of benefits under the deferred compensation plan. As the assets of the trust are available to satisfy the claims of general creditors if the Company becomes insolvent, the amounts held in the trust are accounted for as an investment on the Company's consolidated balance sheet of $32.3 million and $37.7 million for the years ended December 31, 2016 and 2017, respectively.

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- Definition The entire disclosure for compensation costs, including compensated absences accruals, compensated absences liability, deferred compensation arrangements and income statement compensation items. Deferred compensation arrangements may include a description of an arrangement with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain amounts at designated future dates, usually including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares (units) issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI http://asc.fasb.org/topic&trid=2127225 + Details
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