CONSOLIDATED STATEMENTS OF Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 9,856	$ 9,103
Adjustments to reconcile net earnings to net cash used in operating activities:
Depreciation and amortization	5,152	5,050
Deferred income taxes	671	132
Amortization of marketable security premiums	748	791
Changes in operating assets and liabilities:
Accounts receivable	10,627	1,450
Other receivables	109	(404)
Inventories	(6,706)	(10,847)
Prepaid expenses and other assets	1,353	888
Accounts payable and accrued liabilities	(4,406)	(968)
Income taxes payable	(2,619)	1,909
Postretirement health care benefits	(312)	(192)
Deferred compensation and other liabilities	507	109
Net cash from operating activities	14,980	7,021
CASH FLOWS FROM INVESTING ACTIVITIES:
Restricted cash	1	175
Capital expenditures	(8,376)	(2,418)
Purchases of trading securities	(2,485)	(2,573)
Sales of trading securities	613	501
Purchase of available for sale securities	(23,348)	(9,107)
Sale and maturity of available for sale securities	4,871	6,622
Net cash used in investing activities	(28,724)	(6,800)
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares purchased and retired	(6,576)	(4,544)
Dividends paid in cash	(10,943)	(9,613)
Repayment of bank loans	(612)	(52)
Proceeds from bank loans	809
Net cash used in financing activities	(17,322)	(14,209)
Effect of exchange rate changes on cash	(22)	(690)
Decrease in cash and cash equivalents	(31,088)	(14,678)
Cash and cash equivalents at beginning of year	126,145	100,108
Cash and cash equivalents at end of year	95,057	85,430
Supplemental cash flow information:
Income taxes paid, net	6,352	2,410
Interest paid	1	11
Stock dividend issued	$ 61,671	$ 57,230