CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net (loss) income	$ (70,494,000)	$ (4,160,000)	$ 35,314,000
Adjustments to reconcile net loss to net cash provided by operating activities:
Provision for credit losses	88,076,000	78,229,000	64,278,000
Stock-based compensation expense	28,702,000	83,649,000	68,255,000
Depreciation	59,246,000	52,621,000	39,915,000
Amortization of intangibles	16,430,000	42,902,000	55,482,000
Deferred income taxes	(36,306,000)	(15,278,000)	(3,250,000)
Impairment of long-lived and right-of-use assets	12,671,000	169,000	30,000
Non-cash lease expense	12,880,000	13,659,000	12,318,000
Revenue reserves	8,569,000	10,251,000	5,934,000
Other adjustments, net	5,107,000	1,702,000	2,241,000
Changes in assets and liabilities, net of effects of acquisitions and dispositions:
Accounts receivable	(115,379,000)	(79,830,000)	(78,954,000)
Other assets	923,000	(7,672,000)	1,064,000
Accounts payable and other liabilities	14,018,000	30,597,000	24,332,000
Operating lease liabilities	(16,847,000)	(13,391,000)	(10,705,000)
Income taxes payable and receivable	232,000	(1,243,000)	1,650,000
Deferred revenue	(1,619,000)	(3,786,000)	(3,743,000)
Net cash provided by operating activities	6,209,000	188,419,000	214,161,000
Cash flows from investing activities:
Acquisitions, net of cash acquired	(25,607,000)	(2,264,000)	(20,341,000)
Capital expenditures	(70,215,000)	(52,488,000)	(68,804,000)
Purchases of marketable debt securities	0	(99,977,000)	0
Proceeds from maturities of marketable debt securities	50,000,000	50,000,000	25,000,000
Net proceeds from the sale of a business	750,000	731,000	23,615,000
Proceeds from sale of fixed assets	0	20,000	0
Other, net	0	24,000	(103,000)
Net cash used in investing activities	(45,072,000)	(103,954,000)	(40,633,000)
Cash flows from financing activities:
Proceeds from the issuance of Senior Notes	0	500,000,000	0
Principal payments on Term Loan	(220,000,000)	(27,500,000)	(13,750,000)
Debt issuance costs	0	(6,484,000)	0
Principal payments on related party debt	0	0	(1,008,000)
Purchase of treasury stock	(35,403,000)	(63,674,000)	(56,905,000)
Proceeds from the exercise of stock options	0	0	573,000
Withholding taxes paid on behalf of employees on net settled stock-based awards	(61,908,000)	(64,079,000)	(35,284,000)
Distribution from IAC pursuant to the tax sharing agreement	0	3,071,000	(11,355,000)
Purchase of noncontrolling interests	(27,857,000)	(4,281,000)	(71,000)
Other, net	0	0	(3,732,000)
Net cash (used in) provided by financing activities	(345,168,000)	337,053,000	(121,532,000)
Total cash (used) provided	(384,031,000)	421,518,000	51,996,000
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(45,000)	565,000	661,000
Net (decrease) increase in cash and cash equivalents and restricted cash	(384,076,000)	422,083,000	52,657,000
Cash and cash equivalents and restricted cash at beginning of period	813,561,000	391,478,000	338,821,000
Cash and cash equivalents and restricted cash at end of period	$ 429,485,000	$ 813,561,000	$ 391,478,000