Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jul. 16, 2018	Feb. 11, 2018
Numerator:
Net income (loss)	$ 12,334	$ 16,087
Denominator:
Weighted average Class A Shares Outstanding - basic	26,450	26,450
Effect of dilutive shares	329	284
Weighted average Class A Shares Outstanding - diluted	26,779	26,734
Earnings per Class A Share - basic	$ 0.47	$ 0.61
Earnings per Class A Share - diluted	$ 0.46	$ 0.60
Class A Common Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Common Stock, Shares, Outstanding	26,450,000	26,450,000	37,646,562	0
Denominator:
Weighted average Class A Shares Outstanding - diluted	26,779,000	26,734,000
Earnings per Class A Share - basic	$ 0.47	$ 0.61
Earnings per Class A Share - diluted	$ 0.46	$ 0.60
Class B Common Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Common Stock, Shares, Outstanding	48,439,772	48,439,772	37,243,210	0
Denominator:
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		48,439,772