Stock-Based Compensation Plans - Summary of Stock Option Activity (Details) - USD ($)			12 Months Ended
	Jun. 01, 2017	Mar. 08, 2017	Dec. 31, 2017	Dec. 31, 2016
Number of Shares (in thousands)
Number of Shares, beginning balance			0
Number of Shares, Granted	28,856	333,719	175,000
Number of Shares, Exercised			0
Number of Shares, Forfeited			(3,000)
Number of Shares, Expired			0
Number of Shares, ending balance			172,000	0
Weighted Average Exercise Price (per share)
Weighted Average Exercise Price, beginning balance (per share)			$ 0.00
Weighted Average Exercise Price, Granted (per share)			10.48
Weighted Average Exercise Price, Exercised (per share)			0.00
Weighted Average Exercise Price, Forfeited (per share)			10.48
Weighted Average Exercise Price, Expired (per share)			0.00
Weighted Average Exercise Price, ending balance (per share)			$ 10.48	$ 0.00
Weighted Average Remaining Contractual Term (years)			9 years 3 months 22 days	0 days
Aggregate Intrinsic Value, Outstanding (in thousands)			$ 5,434,000
Aggregate Intrinsic Value, Exercisable (in thousands)			$ 0