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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net income $ 23,308 $ 18,381
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 8,908 9,649
Pension expense 4,177 6,670
Stock based compensation 1,790 (191)
Contributions to pension plan (2,000) (2,000)
Changes in operating assets and liabilities:    
Accounts receivable, net (8,644) 5,543
Inventories, net 342 (6,355)
Accounts payable 6,692 (2,209)
Commissions payable 1,099 (1,013)
Deferred revenue and customer deposits 1,646 (825)
Income taxes 1,341 1,237
Accrued expenses and other (1,089) 135
Benefit obligations 3,965 2,406
Net cash provided by operating activities 41,535 31,428
Cash used for investing activities:    
Capital additions (5,617) (6,258)
Other 572 237
Net cash used for investing activities (5,045) (6,021)
Cash used for financing activities:    
Cash dividends (12,145) (11,348)
Treasury share repurchases (231) (361)
Other (689) (243)
Net cash used for financing activities (13,065) (11,952)
Effect of exchange rate changes on cash (508) (345)
Net increase in cash and cash equivalents 22,917 13,110
Cash and cash equivalents:    
Beginning of period 108,203 80,555
End of period $ 131,120 $ 93,665