Condensed Consolidated Statement Stockholders' Deficit - 9 months ended Sep. 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	121,399			$ 46			121,445
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
Issuance of Class A common stock for an acquisition by a subsidiary	5,719			$ 1			$ 5,720
Issuance of Class A common stock for an acquisition by a subsidiary (in shares)							164,000
Non-controlling interest adjustment for capital contribution of Class A common stock for an acquisition by a subsidiary	(2,261)		3,678				$ 1,417
Equity-based compensation	2,792						2,792
Redemption of LLC common units for Class A common stock	69,091		5,191	$ 66			74,348
Redemption of LLC common units for Class A common stock (in shares)				6,526,000	(4,972,000)
Distributions to holders of LLC Units			(124,996)				(124,996)
Dividends		(11,874)					(11,874)
Deferred tax adjustments related to Tax Receivable Agreement	(55,858)						(55,858)
Non-controlling interest adjustment	(4,442)		5,031				589
Net income		46,985	193,036	$ 240,021			240,021
Balance at Sep. 30, 2017	$ 157,031	$ 35,655	$ 65,950	$ 302	$ 6		$ 258,944
Balance (in shares) at Sep. 30, 2017				30,227,061	57,031,184	1