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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 30,104 $ 28,203 $ 28,804
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 13,588 12,066 11,459
Pension expense 7,164 6,946 6,070
Contributions to pension plan (4,200) (7,200) (7,200)
Deferred income taxes 241 2,193 1,608
Gain on sale of machinery and equipment (2,535)    
Changes in operating assets and liabilities, net of effect of acquisitions:      
Accounts receivable - net (662) 710 (4,423)
Inventories - net (48) (8,583) (21,744)
Accounts payable 2,985 (1,911) 3,637
Commissions payable (1,487) (189) 1,166
Deferred revenue 7,112    
Accrued expenses 6,947 4,727 8,211
Benefit obligations and other (8,823) (4,329) (6,456)
Net cash provided by operating activities 50,386 32,633 21,132
Capital additions (21,015) (16,373) (11,175)
Proceeds from sale of machinery and equipment 2,905    
Redemptions of short-term investments 1 805 958
Payments for acquisitions, net of cash acquired   (20,823)  
Net cash used for investing activities (18,109) (36,391) (10,217)
Cash dividends (8,662) (8,188) (7,430)
Proceeds from bank borrowings 6,000 17,000  
Payments to bank for borrowings (19,000) (5,000) (15,000)
Net cash (used for) provided by financing activities (21,662) 3,812 (22,430)
Effect of exchange rate changes on cash 389 (77) (572)
Net increase (decrease) in cash and cash equivalents 11,004 (23) (12,087)
Cash and cash equivalents:      
Beginning of year 20,119 20,142 32,229
End of year $ 31,123 $ 20,119 $ 20,142