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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 25,109 $ 36,141 $ 30,104
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 15,282 14,615 13,588
Pension expense 7,657 2,708 7,164
Contributions to pension plan (4,000) (2,500) (4,200)
Deferred income taxes (563) (1,367) 241
Gain on sale of property, plant and equipment (88) (343) (2,535)
Changes in operating assets and liabilities, net of effects of acquisitions:      
Accounts receivable – net (4,750) (8,529) (662)
Inventories – net 12,576 (2,987) (48)
Accounts payable (4,123) (693) 2,985
Commissions payable (1,498) 3,367 (1,487)
Deferred revenue (2,425) (3,024) 7,112
Accrued expenses (2,436) (3,700) 6,947
Benefit obligations and other (58) (4,685) (8,823)
Net cash provided by operating activities 40,683 29,003 50,386
Cash flows from investing activities:      
Capital additions – net (8,260) (13,278) (21,014)
Proceeds from sale of property, plant and equipment 466 681 $ 2,905
Payments for acquisitions, net of cash acquired (3,386) (16,667)
Net cash used for investing activities (11,180) (29,264) $ (18,109)
Cash flows from financing activities:      
Cash dividends (10,599) $ (9,715) $ (8,662)
Treasury shares repurchased (4,579)
Proceeds from bank borrowings   $ 18,000 $ 6,000
Payments to bank for borrowings (13,912) (15,000) (19,000)
Net cash used for financing activities (29,090) (6,715) (21,662)
Effect of exchange rate changes on cash (1,180) 344 389
Net (decrease) increase in cash and cash equivalents (767) (6,632) 11,004
Cash and cash equivalents:      
Beginning of year 24,491 31,123 20,119
End of period $ 23,724 $ 24,491 $ 31,123