Condensed Consolidated Statement Stockholders' Deficit - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Additional Paid-in Capital	Retained Earnings	Non-controlling Interest	Class A common stock	Class B common stock	Class C common stock	Total
Balance at Dec. 31, 2016	$ 74,239	$ 544	$ (103,193)	$ 189	$ 6		$ (28,215)
Balance (in shares) at Dec. 31, 2016				18,935,916	62,002,729	1
Increase (Decrease) in Members' Equity (Deficit)
Issuance of Class A common stock sold in a public offering, net of underwriting discounts, commissions and offering costs	121,425			$ 46			121,471
Issuance of Class A common stock sold in a public offering, net of underwriting discounts, commissions and offering costs (in shares)				4,600,000
Non-controlling interest adjustment for purchase of common units from CWGS, LLC with proceeds from a public offering	(53,648)		87,203				33,555
Equity-based compensation	1,588						1,588
Redemption of LLC common units for Class A common stock	55,623		6,014	$ 56			61,693
Redemption of LLC common units for Class A common stock (in shares)				5,525,000	(4,972,000)
Distributions to holders of LLC Units			(69,335)				(69,335)
Dividends		(7,334)					(7,334)
Deferred tax adjustments related to Tax Receivable Agreement	(45,750)						(45,750)
Non-controlling interest adjustment	(405)		130				(275)
Net income		26,858	127,905	$ 154,763			154,763
Balance at Jun. 30, 2017	$ 153,072	$ 20,068	$ 48,724	$ 291	$ 6		$ 222,161
Balance (in shares) at Jun. 30, 2017				29,061,420	57,031,184	1