Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ 20,169	$ 35,230	$ (1,387)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	25,697	22,420	17,282
Impairment charge	1,600	3,023	40,035
Deferred income taxes	(3,708)	14,554	(6,225)
Non-cash interest	1,314	604	649
Amortization of syndication contracts	468	475	504
Payments on syndication contracts	(470)	(473)	(458)
Non-cash stock-based compensation	20,034	9,595	5,125
(Gain) loss on marketable securities	532
(Gain) loss on disposal of property and equipment	(636)	(4,629)	(731)
Change in fair value of contingent consideration	14,210	8,224
Changes in assets and liabilities:
(Increase) decrease in trade receivables, net	(9,687)	(49,109)	(20,100)
(Increase) decrease in prepaid expenses and other current assets, operating leases right of use asset and other assets	2,017	6,782	11,526
Increase (decrease) in accounts payable, accrued expenses and other liabilities	7,377	18,557	17,229
Net cash provided by operating activities	78,917	65,253	63,449
Cash flows from investing activities:
Proceeds from sale of property and equipment and intangibles	2,708	10,348	5,089
Purchases of property and equipment	(11,468)	(5,819)	(9,060)
Purchases of intangibles			(158)
Purchase of businesses, net of cash acquired		(14,260)	(21,261)
Investment in variable interest entities, net of cash consolidated	(5,164)
Purchases of marketable securities	(106,382)
Proceeds from marketable securities	59,814	27,800	63,480
Purchases of investments		(800)
Net cash provided by (used in) investing activities	(60,492)	17,269	38,090
Cash flows from financing activities:
Proceeds from stock option exercises	219	416
Tax payments related to shares withheld for share-based compensation plans	(4,524)	(4,729)	(1,426)
Payments on long-term debt	(3,252)	(3,000)	(3,000)
Dividends paid	(8,539)	(8,531)	(10,531)
Repurchase of Class A common stock	(11,280)		(525)
Payment of contingent consideration	(65,340)
Principal payments under finance lease obligation	(105)	(126)
Payments of capitalized debt offering and issuance costs		(604)
Net cash used in financing activities	(92,821)	(16,574)	(15,482)
Effect of exchange rates on cash, cash equivalents and restricted cash	(3)	(16)	(3)
Net increase (decrease) in cash, cash equivalents and restricted cash	(74,399)	65,932	86,054
Cash, cash equivalents and restricted cash:
Beginning	185,843	119,911	33,857
Ending	111,444	185,843	119,911
Cash payments for:
Interest	9,562	6,412	7,616
Income taxes	16,921	4,125	7,731
Supplemental disclosures of non-cash investing and financing activities:
Capital expenditures financed through accounts payable, accrued expenses and other liabilities	$ 2,109	942	$ 1,155
Contingent consideration liability related to acquisitions and purchase of noncontrolling interest		$ 106,700