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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net income $ 28,253 $ 22,932
Adjustments to reconcile net income attributable to net cash provided (used) by operating activities:    
Depreciation and amortization 10,751 10,183
Pension expense, including 2013 non-cash settlement loss 2,145 5,914
Contributions to pension plan (2,500) (4,200)
Changes in operating assets and liabilities:    
Accounts receivable (8,297) (5,779)
Inventories (519) 8,764
Accounts payable 1,294 (343)
Commissions payable 1,039 (1,160)
Deferred revenue (3,174) 6,422
Accrued expenses 2,673 2,561
Benefit obligations and other (6,841) (7,578)
Net cash provided by operating activities 24,824 37,716
Cash flows from investing activities:    
Capital additions (7,680) (5,122)
Acquisition, net of cash acquired (16,280)  
Net cash used for investing activities (23,960) (5,122)
Cash flows from financing activities:    
Cash dividends (7,089) (6,300)
Proceeds from bank borrowings 18,000  
Payments to bank for borrowings (9,833) (13,000)
Net cash provided by (used for) financing activities 1,078 (19,300)
Effect of exchange rate changes on cash (125) 150
Net increase in cash and cash equivalents 1,817 13,444
Cash and cash equivalents:    
Beginning of period 31,376 20,119
End of period $ 33,196 $ 33,563