CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 23,094	$ 41,464
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	25,560	26,316
Amortization of intangibles	1,071	1,630
Loss on disposal of property and equipment	216	86
Stock-based compensation expense	25,787	21,025
Amortization of premium (accretion of discount) on marketable securities	(1,252)	146
Deferred income taxes	(8,688)	(9,952)
Decrease in accounts receivable allowance for credit losses	(459)	(454)
Change in operating assets and liabilities:
Accounts receivable	(1,501)	(7,249)
Inventories	(4,516)	(14,826)
Prepaid expenses and other assets	5,614	(837)
Accounts payable	1,914	(2,882)
Taxes payable and accrued liabilities	(385)	(4,975)
Net cash provided by operating activities	66,455	49,492
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(14,241)	(14,741)
Purchases of marketable securities	(97,581)	(173,015)
Proceeds from sales and maturities of marketable securities	103,806	161,897
Acquisition (Note 15)	(9,520)	0
Net cash used in investing activities	(17,536)	(25,859)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock under employee stock plans	5,700	6,237
Repurchase of common stock	(25,979)	(7,834)
Payments of dividends to stockholders	(34,100)	(32,665)
Net cash used in financing activities	(54,379)	(34,262)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(5,460)	(10,629)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	63,929	105,372
CASH AND CASH EQUIVALENTS AT END OF PERIOD	58,469	94,743
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Unpaid property and equipment	1,535	2,429
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes, net	$ 4,400	$ 13,683