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 loss	$ (18,527)	$ (52,293)	$ (46,682)
Adjustments to reconcile net loss to net cash provided by operations
Depreciation and amortization	82,064	91,199	93,802
Deferred income taxes	(21,996)	(16,952)	(18,133)
Stock-based compensation	32,580	3,465	1,503
Impairments of long-lived assets	3,274	1,797	3,220
Provision for bad debts	1,169	432	709
Amortization of financing fees	471	497	497
Amortization of debt discount	3,262	2,357	2,375
Deferred rent	(1,621)	(827)	(529)
Unrealized translation loss (gain) on investment in foreign subsidiaries	(154)	(597)	14
Changes in fair value of derivatives	(7,422)	5,751	11,142
Excess payment on contingent consideration for acquisition	(1,159)	0	0
Changes in operating assets and liabilities
Accounts receivable	(40,086)	165	(11,595)
Insurance receivable	750	14,250	(15,000)
Prepaid expenses	(4,975)	(1,245)	13,640
Other assets	(3,181)	797	(7,881)
Accounts payable	12,950	(3,470)	(2,042)
Litigation settlement obligation	(750)	(14,250)	15,000
Accrued expenses	30,212	(6,396)	3,419
Other liabilities	1,744	11,505	(7,255)
Net cash provided by operating activities	68,605	36,185	36,204
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(3,234)	(2,317)	(5,265)
Purchases of intangible assets and capitalized software	(15,860)	(14,185)	(26,618)
Acquisitions, net of cash acquired	(66,323)	0	(2,000)
Proceeds from disposition of property and equipment	41	236	14
Net cash used in investing activities	(85,376)	(16,266)	(33,869)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of common stock	2,483	3,250	130
Proceeds from issuance of common stock in IPO, net of underwriting discounts and commissions	102,638	0	0
Payments of initial public offering issuance costs	(7,890)	0	0
Capital contribution from certain stockholders	15,576	0	0
Payments of long-term debt	(113,147)	(6,461)	(6,461)
Repayments of revolving credit facility	0	(83,800)	0
Borrowings on revolving credit facility	0	83,800	0
Payment of contingent consideration for acquisition	(738)	0	(1,530)
Payments on equipment capital lease obligations	(9)	(7)	(12)
Net cash used in financing activities	(1,087)	(3,218)	(7,873)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(777)	(367)	427
NET CHANGE IN CASH AND CASH EQUIVALENTS	(18,635)	16,334	(5,111)
Beginning of period	66,633	50,299	55,410
Cash and cash equivalents at end of period	47,998	66,633	50,299
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid during the period for Interest, net of capitalized amounts	30,782	34,658	33,869
Income taxes	5,574	3,224	6,585
Offering costs included in accounts payable and accrued liabilities	225	0	0
Noncash investing activities
Purchases of property and equipment in accounts payable and accrued expenses	109	128	536
Noncash purchase price of business combinations	$ 1,445	$ 0	$ 0