Stock-Based Compensation - Performance-based and Market-based Awards (Details)	1 Months Ended
	Aug. 31, 2018 day $ / shares shares	Apr. 30, 2018 state $ / shares shares	Dec. 31, 2017 day $ / shares shares
Market Based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, share price (in dollars per share)	$ 15.00		$ 15.00
Threshold trading days | day	20		20
Threshold consecutive trading days | day	30		30
Fully Vest on January 1, 2023 | Market Based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	397,693		642,307
Stock options granted (in dollars per share)	$ 7.50		$ 7.50
Vest Annually on December 31 for One Fifth of Each Tranche | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares		115,950
Stock options granted (in dollars per share)		$ 7.50
Number of tranches | state		5