CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities
Net income (loss)	$ 67,808	$ (345,582)	$ (63,040)
Adjustments to reconcile net income (loss) to cash provided by operating activities
Stock-based compensation	143,352	122,210	115,947
Amortization of deferred commissions	59,461	53,471	41,387
Amortization of intangible assets and depreciation	18,746	18,780	28,593
Lease expense	15,912	15,940	13,277
Foreign currency transaction (loss) gain	5,242	(4,560)	6,459
Loss on capped call transactions	1,348	57,382	23,633
Deferred income taxes	363	168,890	(75,336)
(Gain) on investments	(10,841)	(6,578)	(89)
(Gain) on repurchases of convertible senior notes	(7,855)	0	0
Other non-cash	2,255	6,735	7,819
Change in operating assets and liabilities:
Accounts receivable, unbilled receivables, and contract assets	(57,602)	(51,157)	(11,957)
Other current assets	11,360	(9,133)	17,209
Other current liabilities	(8,777)	529	(18,726)
Deferred revenue	45,123	62,578	41,279
Deferred commissions	(44,529)	(53,857)	(71,451)
Other long-term assets and liabilities	(23,581)	(13,312)	(15,886)
Cash provided by operating activities	217,785	22,336	39,118
Investing activities
Purchases of investments	(287,287)	(41,015)	(79,121)
Proceeds from maturities and called investments	242,593	66,583	105,977
Sales of investments	10,725	23,808	61,096
Payments for acquisitions, net of cash acquired	0	(922)	(4,993)
Investment in property and equipment	(16,781)	(35,379)	(10,456)
Cash (used in) provided by investing activities	(50,750)	13,075	72,503
Financing activities
Repurchases of convertible senior notes	(88,989)	0	0
Dividend payments to stockholders	(9,964)	(9,834)	(9,761)
Proceeds from employee stock purchase plan	7,744	9,172	10,554
Proceeds from stock option exercises	10,821	0	0
Common stock repurchases for tax withholdings for net settlement of equity awards	(1,916)	(20,620)	(69,925)
Common stock repurchases under stock repurchase program	0	(25,707)	(52,711)
Other	341	0	0
Cash (used in) financing activities	(81,963)	(46,989)	(121,843)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	2,701	(3,333)	(1,712)
Net increase (decrease) in cash, cash equivalents and restricted cash	87,773	(14,911)	(11,934)
Cash, cash equivalents, and restricted cash, beginning of period	145,054	159,965	171,899
Cash, cash equivalents, and restricted cash, end of period	232,827	145,054	159,965
Supplemental disclosures
Interest paid on convertible notes	4,134	4,500	4,500
Income taxes paid (refunded)	11,664	7,645	(4,552)
Non-cash investing and financing activity:
Investment in property and equipment included in accounts payable and accrued liabilities	66	9,914	2,143
Dividends payable	$ 2,515	$ 2,474	$ 2,454