Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ (15,621)	$ 20,169	$ 35,230
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	28,007	25,697	22,420
Impairment charge	13,267	1,600	3,023
Deferred income taxes	(10,965)	(3,708)	14,554
Non-cash interest	355	1,314	604
Amortization of syndication contracts	471	468	475
Payments on syndication contracts	(480)	(470)	(473)
Non-cash stock-based compensation	23,698	20,034	9,595
(Gain) loss on marketable securities	93	532
(Gain) loss on disposal of assets/business	737	(636)	(4,629)
(Gain) loss on debt extinguishment	1,556
Change in fair value of contingent consideration	(2,539)	14,210	8,224
Changes in assets and liabilities, net of businesses acquired and disposed of:
(Increase) decrease in trade receivables, net	(9,247)	(9,687)	(49,109)
(Increase) decrease in prepaid expenses and other current assets, operating leases right of use asset and other assets	7,826	2,017	6,782
Increase (decrease) in accounts payable, accrued expenses and other liabilities	38,038	7,377	18,557
Net cash provided by operating activities	75,196	78,917	65,253
Cash flows from investing activities:
Proceeds from sale of assets/business	258	2,708	10,348
Purchases of property and equipment	(27,327)	(11,468)	(5,819)
Purchase of businesses, net of cash acquired	(6,930)		(14,260)
Investment in variable interest entities, net of cash consolidated		(5,164)
Purchases of marketable securities	(11,355)	(106,382)
Proceeds from sale of marketable securities	43,335	59,814	27,800
Purchases of investments	(300)		(800)
Issuance of loan receivable	(13,636)
Net cash provided by (used in) investing activities	(15,955)	(60,492)	17,269
Cash flows from financing activities:
Proceeds from stock option exercises	554	219	416
Tax payments related to shares withheld for share-based compensation plans	(4,057)	(4,524)	(4,729)
Payments on debt	(215,745)	(3,252)	(3,000)
Dividends paid	(17,588)	(8,539)	(8,531)
Distributions to noncontrolling interest	(3,380)
Repurchase of Class A common stock	0	(11,280)
Payment of contingent consideration	(35,113)	(65,340)
Principal payments under finance lease obligation	(152)	(105)	(126)
Proceeds from borrowings on debt	213,087
Payments for debt issuance costs	(1,777)		(604)
Net cash used in financing activities	(64,171)	(92,821)	(16,574)
Effect of exchange rates on cash, cash equivalents and restricted cash	(5)	(3)	(16)
Net increase (decrease) in cash, cash equivalents and restricted cash	(4,935)	(74,399)	65,932
Cash, cash equivalents and restricted cash:
Beginning	111,444	185,843	119,911
Ending	106,509	111,444	185,843
Cash payments for:
Interest	16,936	9,562	6,412
Income taxes	13,100	16,921	4,125
Supplemental disclosures of non-cash investing and financing activities:
Capital expenditures financed through accounts payable, accrued expenses and other liabilities	1,987	$ 2,109	942
Fair value of contingent consideration related to acquisitions and purchase of noncontrolling interest	1,854		$ 106,700
Fair value of put and call option	43,600
Dividends equivalents payable	$ 783