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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 9,954 $ 5,818
Adjustments to reconcile net income attributable to net cash (used) provided by operating activities:    
Depreciation and amortization 3,462 3,428
Pension expense, including 2013 non-cash settlement loss 697 2,284
Contributions to pension plan (1,200) (1,800)
Changes in operating assets and liabilities:    
Accounts receivable (12,528) (4,276)
Inventories 1,014 (1,414)
Accounts payable (920) 682
Commissions payable 103 651
Other (1,944) (1,703)
Net cash (used) provided by operating activities (1,362) 3,670
Cash flows from investing activities:    
Capital additions (1,591) (2,349)
Change in short-term investments (1) 4
Net cash used for investing activities (1,592) (2,345)
Cash flows from financing activities:    
Cash dividends (2,692) (2,100)
Payments to bank for borrowings (3,837) (3,000)
Net cash used for financing activities (6,529) (5,100)
Effect of exchange rate changes on cash 110 120
Net decrease in cash and cash equivalents (9,373) (3,655)
Cash and cash equivalents:    
Beginning of year 31,123 20,119
March 31, $ 21,750 $ 16,464