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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 28,203 $ 28,804 $ 25,963
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 12,066 11,459 10,601
Pension expense 6,946 6,070 3,024
Contributions to pension plan (7,200) (7,200) (7,200)
Deferred income taxes 2,193 1,608 4,166
Other (213) 250 1,369
Changes in operating assets and liabilities, net of effect of acquisitions:      
Accounts receivable - net 710 (4,423) (10,618)
Inventories - net (8,583) (21,744) (1,223)
Accounts payable (1,911) 3,637 655
Commissions payable (189) 1,166 2,243
Accrued expenses 4,727 8,211 67
Other (4,116) (6,706) (404)
Net cash provided by operating activities 32,633 21,132 28,643
Capital additions, net (16,373) (11,175) (8,310)
Redemptions (purchases) of short-term investments 805 958 (512)
Payments for acquisitions, net of cash acquired (20,823)   (33,856)
Net cash used for investing activities (36,391) (10,217) (42,678)
Cash flows from financing activities:      
Cash dividends (8,188) (7,430) (7,024)
Proceeds from bank borrowings 17,000 0 35,000
Payments to bank for borrowings (5,000) (15,000) (25,000)
Treasury stock purchase   0 (638)
Purchase of noncontrolling interest     (607)
Net cash provided by (used for) financing activities 3,812 (22,430) 1,731
Effect of exchange rate changes on cash (77) (572) 130
Net decrease in cash and cash equivalents (23) (12,087) (12,174)
Cash and cash equivalents:      
Beginning of year 20,142 32,229 44,403
End of year $ 20,119 $ 20,142 $ 32,229