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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income $ 26,555 $ 24,883 $ 25,109
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 15,053 15,529 15,282
Pension expense 6,368 3,431 7,657
Contributions to pension plan (2,000) (16,000) (4,000)
Deferred income tax (benefit) charge (6,140) 3,511 (563)
Gain on sale of property, plant and equipment 153 (607) (88)
Impairment of goodwill and other intangible assets 4,098 1,800
Changes in operating assets and liabilities, net of effects of acquisitions:      
Accounts receivable, net 5,473 5,273 (4,750)
Inventories, net (4,305) 13,904 12,576
Accounts payable (1,268) 1,393 (4,123)
Commissions payable (3,849) 3,300 (1,498)
Deferred revenue (902) (380) (2,425)
Accrued expenses and other 3,958 (7,996) (2,436)
Income taxes 7,950 64 815
Benefit obligations (7,879) 5,329 (873)
Net cash provided by operating activities 43,265 53,434 40,683
Cash flows from investing activities:      
Capital additions (7,754) (6,877) (8,260)
Proceeds from sale of property, plant and equipment 320 1,379 466
Purchase of short-term investments, net (2,976)
Payments for acquisitions, net of cash acquired (2,968) (3,386)
Net cash used for investing activities (10,410) (8,466) (11,180)
Cash flows from financing activities:      
Cash dividends (12,268) (11,218) (10,599)
Treasury shares repurchased (4,579)
Proceeds from bank borrowings
Payments to banks for borrowings (13,912)
Net cash used for financing activities (12,268) (11,218) (29,090)
Effect of exchange rate changes on cash 1,489 130 (1,180)
Net increase (decrease) in cash and cash equivalents 22,076 33,880 (767)
Cash and cash equivalents:      
Beginning of year 57,604 23,724 24,491
End of period $ 79,680 $ 57,604 $ 23,724