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Condensed Consolidated Statements Of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net income $ 17,809 $ 16,044
Adjustments to reconcile net income attributable to net cash provided by operating activities:    
Depreciation and amortization 5,885 5,629
Pension expense 2,002 1,624
Contributions to pension plan (3,000) (3,000)
Changes in operating assets and liabilities:    
Accounts receivable (5,899) (9,271)
Inventories (12,246) (13,523)
Accounts payable 4,122 5,728
Commissions payable 423 290
Other 2,856 3,807
Net cash provided by operating activities 11,952 7,328
Cash flows from investing activities:    
Capital additions (10,979) (5,924)
Change in short-term investments 212 259
Net cash used for investing activities (10,767) (5,665)
Cash flows from financing activities:    
Cash dividends (3,988) (3,651)
Payments to bank for borrowings (1,000) (5,000)
Other   (28)
Net cash used for financing activities (4,988) (8,679)
Effect of exchange rate changes on cash (99) 505
Net decrease in cash and cash equivalents (3,902) (6,511)
Cash and cash equivalents:    
Beginning of year 20,142 32,229
June 30, $ 16,240 $ 25,718