CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 8,911	$ 8,101
Adjustments to reconcile net earnings to net cash used in operating activities:
Depreciation and amortization	4,666	4,578
Deferred income taxes	149	(415)
Amortization of marketable security premiums	353	456
Changes in operating assets and liabilities:
Accounts receivable	5,927	5,858
Other receivables	(267)	(2,729)
Inventories	(11,100)	(12,845)
Prepaid expenses and other assets	983	4,052
Accounts payable and accrued liabilities	(2,770)	(501)
Income taxes payable	2,930	2,761
Postretirement health care benefits	(150)	(233)
Deferred compensation and other liabilities	924	584
Net cash from operating activities	10,556	9,667
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(4,683)	(7,722)
Purchases of trading securities	(2,360)	(3,258)
Sales of trading securities	362	239
Purchase of available for sale securities	(20,919)	(34,061)
Sale and maturity of available for sale securities	5,379	11,670
Net cash used in investing activities	(22,221)	(33,132)
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares purchased and retired	(10,519)	(12,498)
Dividends paid in cash	(11,530)	(11,282)
Proceeds from bank loans	941	641
Repayment of bank loans	(544)	(661)
Net cash used in financing activities	(21,652)	(23,800)
Effect of exchange rate changes on cash	80	829
Decrease in cash and cash equivalents	(33,237)	(46,436)
Cash, cash equivalents, and restricted cash at beginning of year	111,287	96,720
Cash, cash equivalents, and restricted cash at end of quarter	78,050	50,284
Supplemental cash flow information:
Income taxes paid/(received), net	(20)	(206)
Interest paid	31	24
Stock dividend issued	$ 70,557	$ 60,538