CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income (loss)	$ 179,821	$ 333,904	$ (14,310)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Stock-based compensation	44,880	45,011	35,552
Depreciation	30,980	33,687	31,517
Amortization of intangible assets	11,710	14,741	15,610
Non-cash interest expense and amortization of convertible debt issuance costs	0	3	207
Loss on extinguishment of debt	0	0	83,626
Loss on fair value adjustment of derivatives, net	0	240	10,585
Deferred income taxes	(9,875)	(145,350)	689
Gain on divestiture	0	(90,784)	0
Gain on sale of non-marketable equity security	0	(23,924)	0
Impairment of assets	1,071	10,045	0
Gain on sale of equity security	0	0	(3,547)
Change in fair value of earn-out liability	(5,044)	9,234	3,111
Other	15	645	2,413
Change in operating assets and liabilities, net of effects of acquisition/disposition:
Accounts receivable	(39,835)	(28,931)	(9,274)
Unbilled receivables	26,191	93,796	107,945
Prepaid expenses and other assets	(5,500)	2,763	(89)
Inventories	(8,480)	(15,254)	(12,702)
Income taxes receivable	(21,179)	(87,704)	(618)
Accounts payable	580	(5,768)	11,975
Accrued salaries and benefits and other liabilities	571	41	(4,745)
Income taxes payable	26,275	59,643	(19,279)
Deferred revenue	3,774	(5,048)	(1,354)
Operating lease liabilities	(5,356)	(5,204)	(6,919)
Net cash provided by operating activities	230,599	195,786	230,393
Cash flows from investing activities:
Purchases of property and equipment	(30,697)	(23,240)	(17,478)
Acquisition of intangible assets	0	0	(3,000)
Purchases of marketable securities	(415,374)	(434,155)	(150,949)
Maturities of marketable securities	280,829	175,854	59,642
Proceeds from sale of marketable securities	85,722	117,798	276,687
Proceeds from sale of non-marketable equity security	22,796	0	0
Proceeds from divestiture	0	106,347	0
Proceeds from sale of equity security	0	0	3,009
Acquisition of businesses, net of cash acquired	0	0	(15,932)
Net cash provided by (used in) investing activities	(56,724)	(57,396)	151,979
Cash flows from financing activities:
Proceeds received from issuance of common stock under employee stock plans	5,465	8,950	6,136
Payments of taxes on restricted stock units	(41,340)	(38,328)	(18,413)
Payments under installment payment arrangements	(16,350)	(16,192)	(14,378)
Payments for settlement and repurchase of convertible senior notes	0	(10,381)	(258,060)
Proceeds from retirement of convertible senior note hedges	0	0	91,729
Payments for settlement of warrants	0	(10,697)	(69,528)
Payment of deferred purchase consideration from acquisition	(2,450)	(2,450)	0
Repurchase and retirement of common stock, including prepayment under accelerated share repurchase program	(113,312)	(100,525)	(100,421)
Net cash used in financing activities	(167,987)	(169,623)	(362,935)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(880)	306	(2,007)
Net increase (decrease) in cash, cash equivalents and restricted cash	5,008	(30,927)	17,430
Cash, cash equivalents and restricted cash at beginning of year	94,767	125,694	108,264
Cash, cash equivalents and restricted cash at end of year	99,775	94,767	125,694
Cash paid during the period for:
Interest	0	73	1,525
Income taxes, net of refunds	27,132	25,932	25,275
Non-cash investing and financing activities:
Property and equipment received and accrued in accounts payable and other liabilities	3,935	21,768	39,035
Issuance of common stock in connection with the payments of earn-out related to the PLDA Group acquisition	7,456	16,556	0
Operating lease right-of-use assets obtained in exchange for operating lease obligations	$ 4,799	$ 1,690	$ 5,931