CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 64,302	$ 62,491
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	13,717	13,783
Deferred income taxes	(883)	21
Amortization of marketable security premiums	1,560	3,188
Changes in operating assets and liabilities:
Accounts receivable	(18,459)	(20,580)
Other receivables	4,118	20
Inventories	(1,132)	(22,437)
Prepaid expenses and other assets	3,581	(15,472)
Accounts payable and accrued liabilities	10,256	14,023
Income taxes payable	(7,719)	4,134
Postretirement health care benefits	(488)	(551)
Deferred compensation and other liabilities	1,249	986
Net cash provided by operating activities	70,102	39,606
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(13,911)	(19,458)
Purchases of trading securities	(1,934)	(1,526)
Sales of trading securities	482	574
Purchase of available for sale securities	(82,391)	(65,616)
Sale and maturity of available for sale securities	65,578	86,259
Net cash (used in) provided by investing activities	(32,176)	233
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares purchased and retired	(2,196)	(27,550)
Dividends paid in cash	(19,062)	(18,825)
Proceeds from bank loans	2,885	2,922
Repayment of bank loans	(2,908)	(2,939)
Net cash used in financing activities	(21,281)	(46,392)
Effect of exchange rate changes on cash	(846)	598
Increase (decrease) in cash and cash equivalents	15,799	(5,955)
Cash, cash equivalents and restricted cash at beginning of year	76,290	53,635
Cash, cash equivalents and restricted cash at end of quarter	92,089	47,680
Supplemental cash flow information:
Income taxes paid, net	26,861	15,524
Interest paid	204	187
Stock dividend issued	$ 66,243	$ 86,433