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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net income $ 18,381 $ 27,477
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 9,649 10,563
Pension expense 6,670 2,117
Contributions to pension plan (2,000) 0
Stock based compensation (191) 426
Changes in operating assets and liabilities:    
Accounts receivable, net 5,543 3,733
Inventories, net (6,355) 13,291
Accounts payable (2,209) (1,008)
Commissions payable (1,013) (2,575)
Deferred revenue and customer deposits (825) 1,208
Income taxes 1,237 3,175
Accrued expenses and other 135 (1,454)
Benefit obligations 2,406 1,394
Net cash provided by operating activities 31,428 58,347
Cash used for investing activities, capital additions (6,021) (7,985)
Cash used for financing activities:    
Cash dividends (11,348) (10,581)
Treasury share repurchases (361) 0
Other (243) (482)
Net cash used for financing activities (11,952) (11,063)
Effect of exchange rate changes on cash (345) (55)
Net increase in cash and cash equivalents 13,110 39,244
Cash and cash equivalents:    
Beginning of period 80,555 46,458
End of period $ 93,665 $ 85,702