CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 65,308	$ 58,974	$ 64,839
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	17,570	18,184	18,779
Deferred income taxes	(1,263)	(279)	2,832
Impairment of majority-owned foreign subsidiaries			377
Amortization of marketable security premiums	3,837	1,404	1,282
Changes in operating assets and liabilities:
Accounts receivable	(14,130)	3,483	5,086
Other receivables	(706)	636	(313)
Inventories	3,940	(770)	(4,383)
Prepaid expenses and other assets	2,622	2,961	4,362
Accounts payable and accrued liabilities	10,010	3,849	1,080
Income taxes payable	(1,296)	3,012	4,336
Postretirement health care benefits	(1,281)	(1,041)	(1,478)
Deferred compensation and other liabilities	687	(15,703)	3,422
Net cash provided by operating activities	85,298	74,710	100,221
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(31,426)	(17,970)	(20,258)
Repayment of premiums on split dollar life insurance policies	2,514	23,527
Purchases of trading securities	(2,668)	(3,183)	(3,427)
Sales of trading securities	968	18,058	795
Purchase of available for sale securities	(108,576)	(109,816)	(67,730)
Sale and maturity of available for sale securities	47,289	98,885	75,611
Net cash used in investing activities	(91,899)	9,501	(15,009)
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares purchased and retired	(30,184)	(32,055)	(34,116)
Dividends paid in cash	(24,136)	(23,810)	(23,460)
Proceeds from bank loans	3,792	3,902	3,582
Repayment of bank loans	(3,618)	(3,883)	(3,193)
Net cash used in financing activities	(54,146)	(55,846)	(57,187)
Effect of exchange rate changes on cash	(283)	(449)	28
Increase (decrease) in cash and cash equivalents	(61,030)	27,916	28,053
Cash, cash equivalents and restricted cash at beginning of year	167,256	139,340	111,287
Cash, cash equivalents and restricted cash at end of year	106,226	167,256	139,340
Supplemental cash flow information:
Income taxes paid	22,855	14,503	13,858
Interest paid	6	57	121
Stock dividend issued	$ 64,667	$ 63,402	$ 70,557