CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 11,976	$ 8,911
Adjustments to reconcile net earnings to net cash used in operating activities:
Depreciation	4,647	4,666
Deferred income taxes	(1,013)	149
Amortization of marketable security premiums	217	353
Changes in operating assets and liabilities:
Accounts receivable	8,205	5,927
Other receivables	(197)	(267)
Inventories	(13,676)	(11,100)
Prepaid expenses and other assets	172	983
Accounts payable and accrued liabilities	1,422	(2,770)
Income taxes payable	2,983	2,930
Postretirement health care benefits	(276)	(150)
Deferred compensation and other liabilities	121	924
Net cash provided by operating activities	14,581	10,556
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(3,737)	(4,683)
Purchases of trading securities	(2,287)	(2,360)
Sales of trading securities	380	362
Purchase of available for sale securities	(21,312)	(20,919)
Sale and maturity of available for sale securities	35,217	5,379
Net cash from (used in) investing activities	8,261	(22,221)
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares purchased and retired	(8,809)	(10,519)
Dividends paid in cash	(11,703)	(11,530)
Proceeds from bank loans	928	941
Repayment of bank loans	(880)	(544)
Net cash used in financing activities	(20,464)	(21,652)
Effect of exchange rate changes on cash	(2,278)	80
Increase (Decrease) in cash and cash equivalents	100	(33,237)
Cash, cash equivalents and restricted cash at beginning of year	139,340	111,287
Cash, cash equivalents and restricted cash at end of year	139,440	78,050
Supplemental cash flow information:
Income taxes paid	794	(20)
Interest paid	23	31
Stock dividend issued	$ 63,402	$ 70,557