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Share-Based Compensation	3 Months Ended
Share-Based Compensation	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation We account for share-based awards under the provisions of ASC 718, Compensation—Stock Compensation. Accordingly, share-based compensation cost is measured at the grant date based on the fair value of the award, and we expense these costs using the straight-line method over the requisite service period. Share-based compensation expense was $3.3 million and $2.9 million for the three months ended March 31, 2019 and 2018, respectively.