Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities
Net loss	$ (23,721)	$ (27,444)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	19,549	23,816
Non-cash interest	9,480	9,428
Loss on debt extinguishment	7,257
Stock-based compensation	1,996	1,639
Provision for losses on accounts receivable	1,916	2,155
Deferred income taxes	522	296
Change in fair value of contingent consideration	37	58
Change in fair value of Private Warrants	(1,715)
Changes in operating assets and liabilities:
Accounts receivable	(13,637)	5,866
Prepaid expenses and other assets	(3,109)	(6,519)
Accounts payable and accrued expenses	(996)	(711)
Deferred revenue	(114)	146
Net cash (used in) provided by operating activities	(2,535)	8,730
Investing activities
Acquisitions, net of cash acquired		(3,124)
Purchases of property and equipment	(7,343)	(5,875)
Net cash used in investing activities	(7,343)	(8,999)
Financing activities
Issuance of common stock	38
Revolving credit facility - draws		29,000
Revolving credit facility - repayments		(29,000)
Payments for capital lease obligations	(572)	(455)
Debt acquisition costs	(2,031)
Proceeds long-term debt, net of original issue discount	294,000
Retirement of debt	(289,000)
Payments on long-term debt	(750)	(8,500)
Net cash provided by (used in) financing activities	1,685	(8,955)
Effect of foreign exchange rates	(129)	(84)
Net decrease in cash	(8,322)	(9,308)
Cash at beginning of period	51,201	43,407
Cash at end of period	42,879	34,099
Supplemental disclosure:
Cash paid for interest	20,110	17,248
Income tax refunds	(450)	(297)
Significant non-cash investing and financing activities
Purchases of property and equipment in accounts payable and accrued expenses on the consolidated balance sheets	$ 159	$ 193