CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - 3 months ended Mar. 31, 2018 - USD ($) shares in Thousands, $ in Thousands	Class A Common Stock Common stock	Class B Common Stock Common stock	Members' Equity (Deficit)	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interest	Total
Balance at the beginning of the period at Dec. 31, 2017			$ (36,299)			$ 82		$ (36,217)
Statement of Stockholders'/Members' Equity
Member distributions prior to IPO			(26,000)					(26,000)
Net income prior to IPO and reorganization			13,648					13,648
Effect of IPO and reorganization	$ 265		$ 48,651	$ 71,195			$ 130,861	250,972
Effect of IPO and reorganization (shares)	26,450	48,440
Member distributions after IPO							(41)	(41)
Additional paid-in capital related to tax receivable agreement				11,116				11,116
Other comprehensive income (loss)						239		239
Stock-based compensation				834				834
Net income after IPO and reorganization					$ 3,753		9,007	12,760
Balance at the end of the period at Mar. 31, 2018	$ 265			$ 83,145	$ 3,753	$ 321	$ 139,827	$ 227,311
Balance at the end of the period (shares) at Mar. 31, 2018	26,450	48,440