CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 64,839	$ 56,805	$ 80,654
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	18,779	18,669	18,991
Deferred income taxes	2,832	2,063	(2,337)
Impairment of majority-owned foreign subsidiaries	377	1,126	2,371
Amortization of marketable security premiums	1,282	1,755	2,386
Changes in operating assets and liabilities:
Accounts receivable	5,086	(2,445)	(4,012)
Other receivables	(313)	2,220	(3,146)
Inventories	(4,383)	303	1,558
Prepaid expenses and other assets	4,362	9,489	(22,052)
Accounts payable and accrued liabilities	1,080	1,648	(557)
Income taxes payable	4,336	7,953	(11,899)
Postretirement health care benefits	(1,478)	(2,484)	(1,192)
Deferred compensation and other liabilities	3,422	3,827	(17,792)
Net cash provided by operating activities	100,221	100,929	42,973
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(20,258)	(27,612)	(16,673)
Purchases of trading securities	(3,427)	(4,378)	(5,089)
Sales of trading securities	795	1,255	22,396
Purchase of available for sale securities	(67,730)	(78,377)	(89,364)
Sale and maturity of available for sale securities	75,611	64,602	79,410
Net cash used in investing activities	(15,009)	(44,510)	(9,320)
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares purchased and retired	(34,116)	(19,317)	(34,133)
Dividends paid in cash	(23,460)	(22,978)	(22,621)
Proceeds from bank loans	3,582	2,491	2,162
Repayment of bank loans	(3,193)	(2,549)	(2,289)
Net cash used in financing activities	(57,187)	(42,353)	(56,881)
Effect of exchange rate changes on cash	28	501	421
Increase (decrease) in cash and cash equivalents	28,053	14,567	(22,807)
Cash, cash equivalents and restricted cash at beginning of year	111,287	96,720	119,527
Cash, cash equivalents and restricted cash at end of year	139,340	111,287	96,720
Supplemental cash flow information:
Income taxes paid	13,858	5,676	18,854
Interest paid	121	112	68
Stock dividend issued	$ 70,557	$ 60,538	$ 69,739

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