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Condensed Consolidated Statements Of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Net income $ 14,986 $ 17,809
Depreciation and amortization 6,805 5,885
Pension expense, including 2013 non-cash settlement loss 4,641 2,002
Contributions to pension plan (3,600) (3,000)
Accounts receivable (11,656) (5,899)
Inventories 5,222 (12,246)
Accounts payable 2,138 4,122
Commissions payable (820) 423
Other 3,372 2,856
Net cash provided by operating activities 21,088 11,952
Capital additions (3,399) (10,979)
Change in short-term investments 3 212
Net cash used for investing activities (3,396) (10,767)
Cash dividends (4,199) (3,988)
Payments to bank for borrowings (7,000) (1,000)
Net cash used for financing activities (11,199) (4,988)
Effect of exchange rate changes on cash 239 (99)
Net increase (decrease) in cash and cash equivalents 6,732 (3,902)
Beginning of year 20,119 20,142
June 30, $ 26,851 $ 16,240