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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 18,814 $ 14,986
Adjustments to reconcile net income attributable to net cash provided (used) by operating activities:    
Depreciation and amortization 7,048 6,805
Pension expense, including 2013 non-cash settlement loss 1,437 4,641
Contributions to pension plan (1,200) (3,600)
Changes in operating assets and liabilities:    
Accounts receivable (13,660) (11,656)
Inventories 3,396 5,222
Accounts payable 1,650 2,138
Commissions payable 628 (820)
Other (6,128) 3,372
Net cash provided by operating activities 11,985 21,088
Cash flows from investing activities:    
Capital additions (5,586) (3,399)
Acquisition, net of cash acquired (16,280)  
Change in short-term investments (2) 3
Net cash used for investing activities (21,868) (3,396)
Cash flows from financing activities:    
Cash dividends (4,726) (4,199)
Proceeds from bank borrowings 18,000  
Payments to bank for borrowings (4,333) (7,000)
Net cash provided by (used for) financing activities 8,941 (11,199)
Effect of exchange rate changes on cash (735) 239
Net (decrease) increase in cash and cash equivalents (1,677) 6,732
Cash and cash equivalents:    
Beginning of period 31,123 20,119
End of period $ 29,446 $ 26,851