CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 44,021	$ 50,301
Adjustments to reconcile net earnings to net cash used in operating activities:
Depreciation	13,777	14,112
Deferred income taxes	(319)	279
Amortization of marketable security premiums	965	976
Changes in operating assets and liabilities:
Accounts receivable	(22,875)	(38,516)
Other receivables	281	(702)
Inventories	(13,001)	(15,867)
Prepaid expenses and other assets	2,742	3,384
Accounts payable and accrued liabilities	9,462	10,635
Income taxes payable	5,964	9,863
Postretirement health care benefits	(845)	(883)
Deferred compensation and other liabilities	(16,084)	2,594
Net cash provided by operating activities	24,088	36,176
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(11,425)	(14,151)
Purchases of trading securities	(2,718)	(2,835)
Sales of trading securities	17,673	362
Purchase of available for sale securities	(82,862)	(49,999)
Sale and maturity of available for sale securities	67,215	51,580
Net cash from (used in) investing activities	(12,117)	(15,043)
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares purchased and retired	(23,505)	(27,232)
Dividends paid in cash	(17,850)	(17,592)
Proceeds from bank loans	3,048	2,662
Repayment of bank loans	(2,900)	(2,233)
Net cash used in financing activities	(41,207)	(44,395)
Effect of exchange rate changes on cash	(1,443)	(256)
Increase (Decrease) in cash and cash equivalents	(30,679)	(23,518)
Cash, cash equivalents and restricted cash at beginning of year	139,340	111,287
Cash, cash equivalents and restricted cash at end of quarter	108,661	87,769
Supplemental cash flow information:
Income taxes paid/(received), net	6,904	5,182
Interest paid	53	95
Stock dividend issued	$ 63,402	$ 70,557