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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income $ 14,526 $ 11,120
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,951 6,325
Pension expense 3,170 5,006
Stock based compensation 1,301 (95)
Contributions to pension plan 0 (2,000)
Changes in operating assets and liabilities:    
Accounts receivable, net (8,029) 4,652
Inventories, net 677 (7,257)
Accounts payable 7,292 721
Commissions payable (132) (468)
Deferred revenue and customer deposits 2,614 (1,104)
Income taxes 805 994
Accrued expenses and other (1,477) (799)
Benefit obligations 1,413 (21)
Net cash provided by operating activities 28,111 17,074
Cash used for investing activities:    
Capital additions (3,548) (3,655)
Other 577 198
Net cash used for investing activities (2,971) (3,457)
Cash used for financing activities:    
Cash dividends (8,095) (7,562)
Treasury share repurchases (231) (361)
Other (658) (285)
Net cash used for financing activities (8,984) (8,208)
Effect of exchange rate changes on cash (65) (179)
Net increase in cash and cash equivalents 16,091 5,230
Cash and cash equivalents:    
Beginning of period 108,203 80,555
End of period $ 124,294 $ 85,785