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Condensed Consolidated Statements Of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net income $ 10,241 $ 7,119
Adjustments to reconcile net income attributable to net cash provided by operating activities:    
Depreciation and amortization 2,948 2,805
Pension expense 960 772
Contributions to pension plan (1,200) (1,200)
Changes in operating assets and liabilities:    
Accounts receivable (6,631) (2,816)
Inventories (4,437) (5,509)
Accounts payable 2,591 2,073
Commissions payable (2,024) (552)
Other 3,747 2,683
Net cash provided by operating activities 6,195 5,375
Cash flows from investing activities:    
Capital additions (4,523) (2,299)
Change in short-term investments 153 173
Net cash used for investing activities (4,370) (2,126)
Cash flows from financing activities:    
Cash dividends (1,889) (1,763)
Payments to bank for borrowings   (3,000)
Net cash used for financing activities (1,889) (4,763)
Effect of exchange rate changes on cash 279 370
Net increase (decrease) in cash and cash equivalents 215 (1,144)
Cash and cash equivalents:    
Beginning of year 20,142 32,229
March 31, $ 20,357 $ 31,085