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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 7,429 $ 5,486
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,982 3,182
Pension expense 761 2,225
Stock based compensation 836 (93)
Changes in operating assets and liabilities:    
Accounts receivable, net (3,576) 1,951
Inventories, net 3,073 (2,906)
Accounts payable 3,397 (786)
Commissions payable (771) (605)
Deferred revenue and customer deposits 711 675
Income taxes 986 1,781
Accrued expenses and other (1,296) (907)
Benefit obligations (850) (1,571)
Net cash provided by operating activities 13,682 8,432
Cash used for investing activities:    
Capital additions (864) (1,697)
Other 516 30
Net cash used for investing activities (348) (1,667)
Cash used for financing activities:    
Cash dividends (4,047) (3,780)
Treasury share repurchases (231) (361)
Other (627) (284)
Net cash used for financing activities (4,905) (4,425)
Effect of exchange rate changes on cash (118) (459)
Net increase in cash and cash equivalents 8,311 1,881
Cash and cash equivalents:    
Beginning of period 108,203 80,555
End of period $ 116,514 $ 82,436