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Stock-Based Compensation	3 Months Ended
Stock-Based Compensation	Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	7. Stock-Based Compensation Stock Plans During the three months ended March 31, 2018, the Company granted 1,125,000 shares of restricted stock. As of March 31, 2018, there were 0.3 million shares available for future grants under the 2015 Omnibus Equity Incentive Plan.