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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:      
Net income $ 35,815 $ 39,979 $ 26,555
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 13,749 14,484 15,053
Pension expense 2,823 4,909 6,368
Contributions to pension plan (4,000) (2,000)
Deferred income tax charge (benefit) (1,198) 337 (6,140)
(Gain) loss on sale of property, plant and equipment (53) (44) 153
Stock based compensation 1,025 1,674 743
Impairment of goodwill and other intangible assets 4,098
Changes in operating assets and liabilities, net of effects of acquisitions:      
Accounts receivable, net 2,218 (1,196) 5,473
Inventories, net 11,452 (13,601) (4,305)
Accounts payable (601) 1,299 (1,268)
Commissions payable (2,140) 1,737 (3,849)
Deferred revenue and customer deposits (321) 741 (902)
Accrued expenses and other 153 1,928 3,215
Income taxes (697) (6,599) 7,950
Benefit obligations (51) (438) (7,879)
Net cash provided by operating activities 62,174 41,210 43,265
Cash flows from investing activities:      
Capital additions (10,912) (10,947) (7,754)
Proceeds from sale of property, plant and equipment 69 512 320
(Purchase of) Proceeds from short-term investments, net (4) 2,967 (2,976)
Net cash used for investing activities (10,847) (7,468) (10,410)
Cash flows from financing activities:      
Regular cash dividends (14,370) (13,317) (12,268)
Special cash dividend (52,234)
Treasury share repurchases (2,610)
Other (383)
Net cash used for financing activities (17,363) (65,551) (12,268)
Effect of exchange rate changes on cash 133 (1,413) 1,489
Net increase (decrease) in cash and cash equivalents 34,097 (33,222) 22,076
Cash and cash equivalents:      
Beginning of year 46,458 79,680 57,604
End of period $ 80,555 $ 46,458 $ 79,680