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	$ (30,006)	$ 71	$ (114,397)	$ 189	$ 6		$ (144,137)
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	(87,203)		87,203
Equity-based compensation	1,588						1,588
Redemption of LLC common units for Class A common stock	53,580		6,014	$ 56			59,650
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)
Establishment of liabilities under the Tax Receivable Agreement and related changes to deferred tax assets associated with that liability	(45,750)						(45,750)
Non-controlling interest adjustment	(1,619)		1,619
Net income		26,866	127,850	$ 154,716			154,716
Balance at Jun. 30, 2017	$ 12,015	$ 19,603	$ 38,954	$ 291	$ 6		$ 70,869
Balance (in shares) at Jun. 30, 2017				29,061,420	57,031,184	1