CONSOLIDATED STATEMENTS OF Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 80,654	$ 67,319	$ 66,127
Adjustments to reconcile net earnings to net cash used in operating activities:
Depreciation and amortization	18,991	19,627	20,388
Deferred income taxes	(2,337)	199	255
Impairment of majority-owned Spanish subsidiaries	2,371
Amortization of marketable security premiums	2,386	2,830	3,105
Changes in operating assets and liabilities:
Accounts receivable	(4,012)	6,869	(8,929)
Other receivables	(3,146)	473	1,119
Inventories	1,558	4,183	7,530
Prepaid expenses and other assets	(22,052)	2,999	11,593
Accounts payable and accrued liabilities	(557)	(2,061)	3,839
Income taxes payable	(11,899)	(5,797)	(115)
Postretirement health care benefits	(1,192)	(1,216)	(903)
Deferred compensation and other liabilities	(17,792)	3,125	(12,936)
Net cash from operating activities	42,973	98,550	91,073
CASH FLOWS FROM INVESTING ACTIVITIES:
Change in restricted cash	(23)		1,149
Capital expenditures	(16,673)	(16,090)	(15,534)
Purchases of trading securities	(5,089)	(4,569)	(4,095)
Sales of trading securities	22,396	1,433	16,644
Purchase of available for sale securities	(89,364)	(81,835)	(61,951)
Sale and maturity of available for sale securities	79,410	49,177	55,264
Net cash used in investing activities	(9,343)	(51,884)	(8,523)
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares purchased and retired	(34,133)	(29,093)	(33,004)
Dividends paid in cash	(22,621)	(22,266)	(20,775)
Proceeds from bank loans	2,162	2,760
Repayment of bank loans	(2,289)	(2,788)	(133)
Net cash used in financing activities	(56,881)	(51,387)	(53,912)
Effect of exchange rate changes on cash	420	(2,279)	(2,601)
Increase (decrease) in cash and cash equivalents	(22,831)	(7,000)	26,037
Cash and cash equivalents at beginning of year	119,145	126,145	100,108
Cash and cash equivalents at end of year	96,314	119,145	126,145
Supplemental cash flow information:
Income taxes paid	18,854	36,365	24,940
Interest paid	68	34	17
Stock dividend issued	$ 69,739	$ 61,671	$ 57,220