CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 10,763	$ 11,976
Adjustments to reconcile net earnings to net cash used in operating activities:
Depreciation	4,365	4,647
Deferred income taxes	174	(1,013)
Amortization of marketable security premiums	739	217
Changes in operating assets and liabilities:
Accounts receivable	6,326	8,205
Other receivables	487	(197)
Inventories	(8,883)	(13,676)
Prepaid expenses and other assets	572	172
Accounts payable and accrued liabilities	(1,204)	1,422
Income taxes payable	2,295	2,983
Postretirement health care benefits	(347)	(276)
Deferred compensation and other liabilities	50	121
Net cash provided by operating activities	15,337	14,581
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(3,787)	(3,737)
Purchases of trading securities	(1,835)	(2,287)
Sales of trading securities	582	380
Purchase of available for sale securities	(30,031)	(21,312)
Sale and maturity of available for sale securities	8,543	35,217
Net cash from (used in) investing activities	(26,528)	8,261
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares purchased and retired	(7,423)	(8,809)
Dividends paid in cash	(11,874)	(11,703)
Proceeds from bank loans	1,070	928
Repayment of bank loans	(896)	(880)
Net cash used in financing activities	(19,123)	(20,464)
Effect of exchange rate changes on cash	(252)	(2,278)
Increase (Decrease) in cash and cash equivalents	(30,566)	100
Cash, cash equivalents and restricted cash at beginning of year	167,256	139,340
Cash, cash equivalents and restricted cash at end of quarter	136,690	139,440
Supplemental cash flow information:
Income taxes paid/(received), net	1,233	794
Interest paid	2	23
Stock dividend issued	$ 64,667	$ 63,402