Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities
Net loss	$ (45,550)	$ (25,506)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	35,091	23,722
Deferred income taxes	(3,346)	(11,176)
Amortization of deferred costs	3,172	2,555
Foreign currency re-measurement loss	311	155
Non-cash interest and other expense	1,669	979
Non-cash stock compensation expense	31,263	18,716
Non-cash loss on retirement of fixed assets	473	0
Non-cash loss on debt extinguishment	0	2,317
Changes in operating assets and liabilities, net of purchase business combinations:
Accounts receivable	13,140	6,405
Prepaids and other	(10,093)	(4,280)
Accounts payable	(1,782)	(903)
Accrued expenses and other liabilities	(8,789)	(5,037)
Deferred revenue	(1,407)	(2,893)
Net cash provided by operating activities	14,152	5,054
Investing activities
Purchase of property and equipment	(833)	(723)
Purchase of customer relationships	(201)	(438)
Purchase business combinations, net of cash acquired	(67,651)	(105,771)
Net cash used in investing activities	(68,685)	(106,932)
Financing activities
Payments on finance leases	(86)	(499)
Proceeds from notes payable, net of issuance costs	(169)	382,306
Payments on notes payable	(4,050)	(323,218)
Taxes paid related to net share settlement of equity awards	(2,140)	(6,108)
Issuance of common stock, net of issuance costs	130,174	151,549
Additional consideration paid to sellers of businesses	(11,652)	(5,886)
Net cash provided by financing activities	112,077	198,144
Effect of exchange rate fluctuations on cash	404	302
Change in cash and cash equivalents	57,948	96,568
Cash and cash equivalents, beginning of period	175,024	16,738
Cash and cash equivalents, end of period	232,972	113,306
Supplemental disclosures of cash flow information:
Cash paid for interest, net of interest rate swaps	22,456	17,554
Cash paid for taxes	2,220	2,185
Sales commissions paid, net of amortization of deferred commissions	4,195	3,712
Non-cash investing and financing activities:
Business combination consideration including holdbacks and earnouts	345	7,926
Equipment acquired pursuant to financing lease obligations	$ 0	$ 44