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Condensed Consolidated Statements Of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 22,932 $ 24,515
Adjustments to reconcile net income attributable to net cash provided by operating activities:    
Depreciation and amortization 10,183 8,927
Pension expense, including 2013 non-cash settlement loss 5,914 3,011
Contributions to pension plan (4,200) (4,200)
Changes in operating assets and liabilities:    
Accounts receivable (5,779) (2,062)
Inventories 8,764 (7,118)
Accounts payable (343) (4,492)
Commissions payable (1,160) (2,084)
Other 1,403 4,168
Net cash provided by operating activities 37,714 20,665
Cash flows from investing activities:    
Capital additions (5,122) (14,165)
Acquisition net of cash acquired   (4,812)
Change in short-term investments 2 806
Net cash used for investing activities (5,120) (18,171)
Cash flows from financing activities:    
Cash dividends (6,300) (6,088)
Payments to bank for borrowings (13,000) (2,000)
Net cash used for financing activities (19,300) (8,088)
Effect of exchange rate changes on cash 150 232
Net increase in cash and cash equivalents 13,444 (5,362)
Cash and cash equivalents:    
Beginning of year 20,119 20,142
September 30, $ 33,563 $ 14,780