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)	$ 35,230	$ (1,387)	$ (19,712)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,420	17,282	16,648
Impairment charge	3,023	40,035	32,097
Deferred income taxes	14,554	(6,225)	5,311
Non-cash interest	604	649	881
Amortization of syndication contracts	475	504	505
Payments on syndication contracts	(473)	(458)	(543)
Equity in net (income) loss of nonconsolidated affiliate			234
Non-cash stock-based compensation	9,595	5,125	4,377
(Gain) loss on disposal of property and equipment	(4,629)	(731)	158
(Gain) loss on debt extinguishment			255
Changes in assets and liabilities:
(Increase) decrease in trade receivables, net	(49,109)	(20,100)	8,610
(Increase) decrease in prepaid expenses and other current assets	6,782	11,526	2,102
Increase (decrease) in accounts payable, accrued expenses and other liabilities	26,781	17,229	(19,384)
Net cash provided by operating activities	65,253	63,449	31,539
Cash flows from investing activities:
Proceeds from sale of property and equipment and intangibles	10,348	5,089
Purchases of property and equipment	(5,819)	(9,060)	(25,283)
Purchases of intangibles		(158)	(2,300)
Purchase of a businesses, net of cash acquired	(14,260)	(21,261)
Purchases of marketable securities			(1,400)
Proceeds from marketable securities	27,800	63,480	43,647
Purchases of investments	(800)		(300)
Net cash provided by (used in) investing activities	17,269	38,090	14,364
Cash flows from financing activities:
Proceeds from stock option exercises	416
Tax payments related to shares withheld for share-based compensation plans	(4,729)	(1,426)	(1,688)
Payments on long-term debt	(3,000)	(3,000)	(28,000)
Dividends paid	(8,531)	(10,531)	(16,962)
Repurchase of Class A common stock		(525)	(12,565)
Pricipal payments under finance lease obligation	(126)
Payments of capitalized debt offering and issuance costs	(604)		(225)
Net cash used in financing activities	(16,574)	(15,482)	(59,440)
Effect of exchange rates on cash, cash equivalents and restricted cash	(16)	(3)	(71)
Net increase (decrease) in cash, cash equivalents and restricted cash	65,932	86,054	(13,608)
Cash, cash equivalents and restricted cash:
Beginning	119,911	33,857	47,465
Ending	185,843	119,911	33,857
Cash payments for:
Interest	6,412	7,616	12,802
Income taxes	4,125	7,731	2,847
Supplemental disclosures of non-cash investing and financing activities:
Capital expenditures financed through accounts payable, accrued expenses and other liabilities	942	$ 1,155	730
Contingent consideration liability related to acquisitions and purchase of noncontrolling interest	$ 106,700		$ 1,641