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Condensed Consolidated Statements Of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net income $ 5,818 $ 10,241
Depreciation and amortization 3,428 2,948
Pension expense 2,284 960
Contributions to pension plan (1,800) (1,200)
Accounts receivable (4,276) (6,631)
Inventories (1,414) (4,437)
Accounts payable 682 2,591
Commissions payable 651 (2,024)
Other (1,703) 3,747
Net cash provided by operating activities 3,670 6,195
Capital additions (2,349) (4,523)
Change in short-term investments 4 153
Net cash used for investing activities (2,345) (4,370)
Cash dividends (2,100) (1,889)
Payments to bank for borrowings (3,000)  
Net cash used for financing activities (5,100) (1,889)
Effect of exchange rate changes on cash 120 279
Net (decrease) increase in cash and cash equivalents (3,655) 215
Beginning of year 20,119 20,142
March 31, $ 16,464 $ 20,357