CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income	$ 30,875	$ 39,984
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	38,112	38,149
Gains from sale of investments	0	(55)
Share-based compensation expense	27,896	25,279
Amortization of operating lease right-of-use assets	3,804	3,082
Deferred income tax benefit	(18,556)	(9,438)
Other	499	0
Changes in operating assets and liabilities, exclusive of effects of acquired companies:
Accounts receivable	77,563	20,637
Income tax payable	25,670	19,512
Prepaid expenses and other current assets	(18,381)	(5,481)
Accounts payable	17,547	6,294
Operating lease liabilities	(2,246)	(3,071)
Accrued liabilities	(36,951)	(30,642)
Deferred revenue	(71,579)	(56,551)
Other long-term liabilities	456	5,842
Net cash provided by operating activities	74,709	53,541
Cash flows from investing activities:
Additions to property and equipment	(2,020)	(4,579)
Purchase of marketable security investments	(10,617)	(4,592)
Proceeds and maturities from marketable security investments	22,975	22,672
Investment in software development	(9,079)	(7,947)
Cost of acquisitions, net of cash acquired	(1,875)	(116,698)
Other	16	(29)
Net cash used by investing activities	(600)	(111,173)
Cash flows from financing activities:
Payment on term loans	(120,000)	(20,000)
Proceeds from exercise of stock options, net of withheld shares for taxes upon equity award	(158)	8,045
Contributions from employee stock purchase plan	3,037	3,678
Net cash used by financing activities	(117,121)	(8,277)
Net decrease in cash and cash equivalents	(43,012)	(65,909)
Cash and cash equivalents at beginning of period	173,857	309,171
Cash and cash equivalents at end of period	130,845	243,262
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	6,784	4,059
Cash paid (received) for income taxes, net	(548)	393
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Non-cash additions to property and equipment	$ 201	$ 464