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 loss		$ (8,868)	$ (32,828)	$ (25,254)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization		107,668	54,177	34,539
Amortization of debt issuance costs		3,382	3,413	3,445
Non-cash operating lease expense		4,104	3,349	3,102
Stock-based compensation expense		104,820	120,234	160,462
Change in fair value of contingent consideration		0	18,057	0
Deferred income taxes		(65,562)	(497)	12,851
Gain on sale of business		0	(11,404)	0
Loss on operating lease assets		1,353	12,569	1,430
Loss on disposal of capitalized software		7,975	0	0
Loss on minority equity interest investment		4,008	0	0
Other		1,348	0	0
Changes in operating assets and liabilities, net of effects of business acquisitions
Accounts receivable		(26,467)	1,375	(43,949)
Prepaid expenses and other assets		(32,162)	(13,644)	17,060
Accounts payable		17,456	(874)	4,207
Accrued expenses and other current liabilities		21,253	(5,268)	14,001
Operating lease liabilities		(2,930)	(4,004)	(2,404)
Other liabilities		914	2,125	(711)
Net cash provided by operating activities		138,292	146,780	178,779
Cash flows from investing activities
Purchase of property and equipment		(1,043)	(3,967)	(4,571)
Acquisitions, net of cash acquired		0	(156,853)	(140,268)
Capitalized software		(54,723)	(51,247)	(29,886)
Investment in minority equity interest		0	(15,007)	(4,008)
Proceeds from sale of business		0	16,576	0
Net cash used in investing activities		(55,766)	(210,498)	(178,733)
Cash flows from financing activities
Payments on long-term debt		(5,271)	(7,029)	(7,029)
Payments for contingent consideration		0	0	(832)
Repurchases of Class A common stock (1)	[1]	(103,974)	(101,721)	0
Proceeds from exercise of stock options		5,941	9,159	35,021
Employee taxes paid related to net share settlement of equity awards		(65,481)	(20,635)	(57,688)
Proceeds from employee stock purchase plan		1,390	0	0
Net cash used in financing activities		(167,395)	(120,226)	(30,528)
Net change in cash and cash equivalents		(84,869)	(183,944)	(30,482)
Cash and cash equivalents
Beginning of period		757,165	941,109	971,591
End of period		672,296	757,165	941,109
Supplemental disclosure of cash flow information
Income tax paid (refunds received), net		17,243	4,356	(18,105)
Interest paid		48,799	30,702	20,198
Non cash investing and financing activities:
Right-of-use assets obtained in exchange for new operating lease liabilities		52	22,491	2,910
Stock-based compensation included in capitalized software		13,144	8,969	7,709
Capitalized software included in accounts payable and accrued expenses and other current liabilities		7,826	4,176	1,086
Capitalized software transferred from prepaid assets		$ 5,751	$ 0	$ 0

[1] Repurchases of Class A common stock for the year ended December 31, 2023 include 12.0 million shares repurchased from related parties (after giving effect to the automatic conversion of Class B common stock to Class A common stock upon such repurchase) for an aggregate consideration of $65.9 million. See "Note 14. Stockholders' Equity" for additional information.