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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net earnings $ 50,301 $ 44,650
Adjustments to reconcile net earnings to net cash used in operating activities:    
Depreciation 14,112 13,933
Deferred income taxes 279 (443)
Amortization of marketable security premiums 976 1,351
Changes in operating assets and liabilities:    
Accounts receivable (38,516) (45,881)
Other receivables (702) (649)
Inventories (15,867) (8,333)
Prepaid expenses and other assets 3,384 8,268
Accounts payable and accrued liabilities 10,635 10,932
Income taxes payable 9,863 15,821
Postretirement health care benefits (883) (720)
Deferred compensation and other liabilities 2,594 2,051
Net cash provided by operating activities 36,176 40,980
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures (14,151) (16,812)
Purchases of trading securities (2,835) (3,807)
Sales of trading securities 362 817
Purchase of available for sale securities (49,999) (65,098)
Sale and maturity of available for sale securities 51,580 45,379
Net cash used in investing activities (15,043) (39,521)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Shares purchased and retired (27,232) (16,650)
Dividends paid in cash (17,592) (17,208)
Proceeds from bank loans 2,662 1,264
Repayment of bank loans (2,233) (1,506)
Net cash used in financing activities (44,395) (34,100)
Effect of exchange rate changes on cash (256) 647
Decrease in cash and cash equivalents (23,518) (31,994)
Cash, cash equivalents, and restricted cash at beginning of year 111,287 96,720
Cash, cash equivalents, and restricted cash at end of quarter 87,769 64,726
Supplemental cash flow information:    
Income taxes paid/(received), net 5,182 (2,811)
Interest paid 95 81
Stock dividend issued $ 70,557 $ 60,538