Employee and Non-Employee Benefit Plans	3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]
Employee and Non-Employee Benefit Plans	Employee and Non-Employee Benefit Plans Equity-Based Compensation Plans. The Company’s equity-based compensation plans provide for the awarding of stock options, stock appreciation rights, shares of restricted stock ("Restricted Stock"), and RSUs for senior executives and salaried employees, as well as non-employee directors. The Company has two active equity-based compensation plans: the Employee Equity Incentive Plan of 2014 (the "2014 Plan") and the Non-Employee Director Equity Incentive Plan (the "Directors' Plan"). As of March 31, 2019, 344,562 RSUs had been granted of the 1,500,000 shares approved under the 2014 Plan, and 71,523 shares had been granted of the 300,000 shares approved under the Directors' Plan. As of March 31, 2019, there were 118,795 unvested RSUs under the Company’s long-term incentive plans and 112,865 were participating securities (Note 5). Deferred Compensation Plan. The Company established an unfunded Executive Deferred Compensation Plan ("EDC Plan") effective as of June 30, 2018, with a purpose to attract and retain highly-compensated key employees by providing participants with an opportunity to defer receipt of a portion of their salary, bonus, and other specified compensation. The Company's obligations under this plan will change in conjunction with the performance of the participants' investments, along with contributions to and withdrawals from the plan. Realized and unrealized gains (losses) on deferred compensation plan investments were insignificant and were included as a component of operating income in the Company’s consolidated statement of income at March 31, 2019, because the Company’s deferred compensation investments consist of mutual funds that are considered trading securities. Plan investments are classified as Level 1 in the fair value hierarchy since the investments trade with sufficient frequency and volume to enable the Company to obtain pricing information on an ongoing basis. From plan inception through December 31, 2018, participants were able to direct the deferral of a portion of their 2018 Short-term incentive plan ("STI Plan") amounts that were paid during first quarter 2019. At the time of payment, the amounts elected for deferral were deposited into the EDC Plan by the Company and allocated by participants among Company-determined investment options. For 2019, participants are able to direct the deferral of a portion of their 2019 base salary and a portion of their estimated, accrued 2019 STI Plan amount. Base salary amounts elected for deferral are deposited into the EDC Plan by the Company on a weekly basis and allocated by participants among Company-determined investment options. At March 31, 2019, the EDC Plan investments were $1,193 and were recorded in Other assets on the Company's Condensed Consolidated Balance Sheet. The EDC Plan liability for base pay and the 2019 STI Plan was $1,421. The current portion of the liability is comprised of estimated amounts to be paid to participants within one year. At March 31, 2019, $179 of the EDC Plan liability was considered current and was included in Accrued expenses in the Company's Condensed Consolidated Balance Sheet, and $1,242 was considered non-current and was included in Other noncurrent liabilities on the Company's Condensed Consolidated Balance Sheet.

Employee and Non-Employee Benefit Plans

Equity-Based Compensation Plans. The Company’s equity-based compensation plans provide for the awarding of stock options, stock appreciation rights, shares of restricted stock ("Restricted Stock"), and RSUs for senior executives and salaried employees, as well as non-employee directors. The Company has two active equity-based compensation plans: the Employee Equity Incentive Plan of 2014 (the "2014 Plan") and the Non-Employee Director Equity Incentive Plan (the "Directors' Plan").

As of March 31, 2019, 344,562 RSUs had been granted of the 1,500,000 shares approved under the 2014 Plan, and 71,523 shares had been granted of the 300,000 shares approved under the Directors' Plan. As of March 31, 2019, there were 118,795 unvested RSUs under the Company’s long-term incentive plans and 112,865 were participating securities (Note 5).

Deferred Compensation Plan. The Company established an unfunded Executive Deferred Compensation Plan ("EDC Plan") effective as of June 30, 2018, with a purpose to attract and retain highly-compensated key employees by providing participants with an opportunity to defer receipt of a portion of their salary, bonus, and other specified compensation. The Company's obligations under this plan will change in conjunction with the performance of the participants' investments, along with contributions to and withdrawals from the plan. Realized and unrealized gains (losses) on deferred compensation plan investments were insignificant and were included as a component of operating income in the Company’s consolidated statement of income at March 31, 2019, because the Company’s deferred compensation investments consist of mutual funds that are considered trading securities.

Plan investments are classified as Level 1 in the fair value hierarchy since the investments trade with sufficient frequency and volume to enable the Company to obtain pricing information on an ongoing basis. From plan inception through December 31, 2018, participants were able to direct the deferral of a portion of their 2018 Short-term incentive plan ("STI Plan") amounts that were paid during first quarter 2019. At the time of payment, the amounts elected for deferral were deposited into the EDC Plan by the Company and allocated by participants among Company-determined investment options.

For 2019, participants are able to direct the deferral of a portion of their 2019 base salary and a portion of their estimated, accrued 2019 STI Plan amount. Base salary amounts elected for deferral are deposited into the EDC Plan by the Company on a weekly basis and allocated by participants among Company-determined investment options. At March 31, 2019, the EDC Plan investments were $1,193 and were recorded in Other assets on the Company's Condensed Consolidated Balance Sheet. The EDC Plan liability for base pay and the 2019 STI Plan was $1,421. The current portion of the liability is comprised of estimated amounts to be paid to participants within one year. At March 31, 2019, $179 of the EDC Plan liability was considered current and was included in Accrued expenses in the Company's Condensed Consolidated Balance Sheet, and $1,242 was considered non-current and was included in Other noncurrent liabilities on the Company's Condensed Consolidated Balance Sheet.