CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 8,803	$ 21,668
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	17,106	17,653
Amortization of intangibles	863	1,086
Loss on disposal of property and equipment	8	22
Stock-based compensation expense	17,449	14,120
Amortization of premium (accretion of discount) on marketable securities	(909)	419
Deferred income taxes	(3,482)	(2,782)
Increase (decrease) in accounts receivable allowance for credit losses	326	(454)
Change in operating assets and liabilities:
Accounts receivable	(2,024)	(10,787)
Inventories	(6,720)	(14,321)
Prepaid expenses and other assets	2,072	(7,241)
Accounts payable	(117)	8,813
Taxes payable and accrued liabilities	161	(5,430)
Net cash provided by operating activities	33,536	22,766
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(8,510)	(7,211)
Purchases of marketable securities	(77,830)	(110,810)
Proceeds from sales and maturities of marketable securities	85,392	98,641
Net cash used in investing activities	(948)	(19,380)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock under employee stock plans	2,691	3,098
Repurchase of common stock	(25,979)	(5,999)
Payments of dividends to stockholders	(22,736)	(21,761)
Net cash used in financing activities	(46,024)	(24,662)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(13,436)	(21,276)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	63,929	105,372
CASH AND CASH EQUIVALENTS AT END OF PERIOD	50,493	84,096
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Unpaid property and equipment	1,306	2,713
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes, net	$ 4,498	$ 11,653