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	$ 200,992	$ 246,263	$ 183,079
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,809	13,069	11,607
Deferred income taxes	(15,594)	(20,018)	8,536
Stock-based compensation expense	20,951	18,269	13,444
Provision for doubtful accounts	2,987	1,129
Provision for excess and obsolete inventory	5,966	5,211	4,565
Accretion of discounts and premiums on marketable securities	(12,435)	(12,077)
Unrealized currency loss on foreign denominated transactions	7,811	2,252	5,986
Mark-to-market adjustment on forward exchange contracts	(267)
Changes in operating assets and liabilities:
Accounts receivable	6,909	(50,755)	(67,270)
Inventories	5,917	(69,957)	(58,433)
Prepaid expenses and other current assets	(11,703)	(16,046)	(6,533)
Accounts payable and other current liabilities	(413)	(8,103)	31,392
Deferred revenue	(71,097)	56,183	86,366
Income taxes	(9,034)	3,786	3,493
Other assets and liabilities	(5,981)	(12,337)	(625)
Net cash provided by operating activities	140,818	156,869	215,607
Cash flows from investing activities
Expenditures for property, plant and equipment and capitalized software	(12,181)	(20,656)	(10,683)
Purchase of short-term investments	(539,120)	(388,809)	(246,571)
Maturities of short-term investments	442,575	308,607
Net cash used in investing activities	(108,726)	(100,858)	(257,254)
Cash flows from financing activities
Net settlement on restricted stock grants	(11,563)	(16,611)	(9,907)
Repurchase of common stock	(60,489)	(52,499)	(57,495)
Proceeds from Employee Stock Purchase Plan purchases	2,385	2,057	1,662
Principal payments on finance lease obligation	(1,525)	(1,240)	(987)
Proceeds from exercise of stock options		25	1,247
Net cash used in financing activities	(71,192)	(68,268)	(65,480)
Effect of exchange rate changes on cash and cash equivalents	(3,787)	(139)	(2,206)
Net decrease in cash, cash equivalents and restricted cash	(42,887)	(12,396)	(109,333)
Cash, cash equivalents and restricted cash at beginning of period	173,951	186,347	295,680
Cash, cash equivalents and restricted cash at end of period	131,064	173,951	186,347
Supplemental disclosure of cash flow information
Income taxes	61,133	54,217	10,763
Interest	$ 4,727	$ 4,874	$ 4,992