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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income $ 6,282 $ 7,275
Adjustments to reconcile net income attributable to net cash provided by operating activities:    
Depreciation and amortization 3,872 3,752
Pension expense 913 $ 913
Contributions to pension plan (2,000)
Changes in operating assets and liabilities:    
Accounts receivable - net (1,301) $ (860)
Inventories - net 5,525 (2,442)
Accounts payable 2,947 2,453
Commissions payable 1,424 1,024
Deferred revenue (104) (777)
Accrued expenses (1,279) (322)
Benefit obligations and other 3,831 (2,053)
Net cash provided by operating activities 20,110 8,963
Cash flows used for investing activities, Capital additions - net (1,212) (1,397)
Cash flows from financing activities:    
Cash dividends $ (2,739) (2,626)
Payments to bank for borrowings (3,000)
Net cash used for financing activities $ (2,739) (5,626)
Effect of exchange rate changes on cash 308 870
Net increase in cash and cash equivalents 16,467 2,810
Cash and cash equivalents:    
Beginning of period 23,724 24,491
End of period $ 40,191 $ 27,301