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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net income $ 27,477 $ 30,491
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 10,563 10,884
Pension expense 2,117 4,301
Contributions to pension plan (4,000)
Stock based compensation 426 1,081
Changes in operating assets and liabilities:    
Accounts receivable, net 3,733 (5,962)
Inventories, net 13,291 (7,811)
Accounts payable (1,008) 1,857
Commissions payable (2,575) 3,062
Deferred revenue and customer deposits 1,208 (210)
Income taxes 3,175 (2,738)
Accrued expenses and other (1,454) (390)
Benefit obligations 1,394 5,980
Net cash provided by operating activities 58,347 36,545
Cash used for investing activities:    
Capital additions (8,027) (7,647)
Proceeds from sale of property, plant and equipment 42 791
Proceeds (purchases) of short-term investments, net 2,968
Net cash used for investing activities (7,985) (3,888)
Cash used for financing activities:    
Cash dividends (10,581) (9,791)
Other (482) (459)
Net cash used for financing activities (11,063) (10,250)
Effect of exchange rate changes on cash (55) (706)
Net increase in cash and cash equivalents 39,244 21,701
Cash and cash equivalents:    
Beginning of period 46,458 79,680
End of period $ 85,702 $ 101,381