Stockholders' Equity	3 Months Ended
Mar. 31, 2019
Equity [Abstract]
Stockholders' Equity	13. STOCKHOLDERS’ EQUITY As of March 31, 2019, 93,748,617 shares of common stock were issued in the accompanying unaudited condensed consolidated balance sheet, which excludes 627,989 unvested shares of common stock and 2,407,905 unvested restricted stock units held by certain participants in the Company’s equity compensation plans (see Note 12–Equity-Based Compensation) and includes 10,174,589 shares of treasury stock held by the Company. Share Repurchase Program The Board had previously authorized a share repurchase program of up to $250.0 million of the Company’s common stock (the “Share Repurchase Program”). Under the Share Repurchase Program, the Company is authorized to repurchase shares through open market purchases, privately-negotiated transactions or otherwise in accordance with applicable federal securities laws, including through Rule 10b5-1 trading plans and under Rule 10b-18 of the Exchange Act. Through December 31, 2018, the Company had repurchased an aggregate of $158.0 million under the Share Repurchase Program. On February 22, 2019, the Board approved a replenishment to the Share Repurchase Program bringing the total amount available for future purchases back up to $250.0 million, which is the remaining authorization as of March 31, 2019. There were no share repurchases under the Share Repurchase Program during the three months ended March 31, 2019 or 2018. The Share Repurchase Program has no time limit and may be suspended or discontinued completely at any time. The number of shares to be purchased and the timing of purchases will be based on the Company’s trading windows and available liquidity, general business and market conditions, and other factors, including legal requirements, debt covenant restrictions and alternative investment opportunities.

Stockholders' Equity

3 Months Ended

Mar. 31, 2019

13. STOCKHOLDERS’ EQUITY

As of March 31, 2019, 93,748,617 shares of common stock were issued in the accompanying unaudited condensed consolidated balance sheet, which excludes 627,989 unvested shares of common stock and 2,407,905 unvested restricted stock units held by certain participants in the Company’s equity compensation plans (see Note 12–Equity-Based Compensation) and includes 10,174,589 shares of treasury stock held by the Company.

Share Repurchase Program

The Board had previously authorized a share repurchase program of up to $250.0 million of the Company’s common stock (the “Share Repurchase Program”). Under the Share Repurchase Program, the Company is authorized to repurchase shares through open market purchases, privately-negotiated transactions or otherwise in accordance with applicable federal securities laws, including through Rule 10b5-1 trading plans and under Rule 10b-18 of the Exchange Act. Through December 31, 2018, the Company had repurchased an aggregate of $158.0 million under the Share Repurchase Program. On February 22, 2019, the Board approved a replenishment to the Share Repurchase Program bringing the total amount available for future purchases back up to $250.0 million, which is the remaining authorization as of March 31, 2019. There were no share repurchases under the Share Repurchase Program during the three months ended March 31, 2019 or 2018.

The Share Repurchase Program has no time limit and may be suspended or discontinued completely at any time. The number of shares to be purchased and the timing of purchases will be based on the Company’s trading windows and available liquidity, general business and market conditions, and other factors, including legal requirements, debt covenant restrictions and alternative investment opportunities.