Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ (24,620)	$ 20,546	$ 47,314
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	31,333	26,106	21,792
Impairment charge - leased assets		7,902
Impairment charge - goodwill	5,123	0	0
Bad debt expense	(1,345)	2,903	4,964
Loss on early extinguishment of debt	264
Equity-based compensation expense	34,298	16,267	10,934
Deferred income tax expense (benefit)	(2,528)	1,899	2,383
Fair value adjustments to contingent consideration	309	814	241
Non-cash change in tax receivable agreements liability	382
Non-cash lease expense (benefit)	(1,335)	(508)
Other, net	522	1,051	1,252
Changes in operating assets and liabilities
Accounts and notes receivable, current portion	3,329	(3,460)	(5,614)
Other current and noncurrent assets	(2,090)	(10,665)	(6,084)
Other current and noncurrent liabilities	11,882	9,035	6,737
Payments pursuant to tax receivable agreements	(3,444)	(3,562)	(3,556)
Income taxes receivable/payable	(9,775)	2,109	178
Deferred revenue, current and noncurrent	137	410	(1,566)
Net cash provided by operating activities	42,442	70,847	78,975
Cash flows from investing activities:
Purchases of property, equipment and capitalization of software	(15,239)	(6,903)	(13,226)
Acquisitions, net of cash acquired of $14.1 million, $0.9 million and $0.1 million, respectively	(180,002)	(10,627)	(14,945)
Restricted cash acquired			28,495
Other	319		(1,200)
Net cash used in investing activities	(194,922)	(17,530)	(876)
Cash flows from financing activities:
Proceeds from the issuance of debt	458,850
Payments on debt	(227,390)	(2,634)	(2,622)
Capitalized debt amendment costs	(3,871)
Distributions paid to non-controlling unitholders	(14,206)	(14,058)	(15,430)
Dividends and dividend equivalents paid to Class A common stockholders	(17,833)	(16,354)	(15,074)
Payments related to tax withholding for share-based compensation	(5,329)	(2,544)	(1,110)
Payment of contingent consideration	(869)	(409)	(306)
Net cash provided by (used in) financing activities	189,352	(35,999)	(34,542)
Effect of exchange rate changes on cash	300	308	70
Net increase in cash, cash equivalents and restricted cash	37,172	17,626	43,627
Cash, cash equivalents and restricted cash, beginning of period	121,227	103,601	59,974
Cash, cash equivalents and restricted cash, end of period	158,399	121,227	103,601
Supplemental disclosures of cash flow information:
Cash paid for interest	10,794	8,663	11,690
Net cash paid for income taxes	$ 14,908	4,993	$ 8,429
Schedule of non-cash investing activities:
Class A shares issued as consideration for acquisitions		$ 8,800