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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net income $ 12,902 $ 13,904
Adjustments to reconcile net income attributable to net cash provided by operating activities:    
Depreciation and amortization 7,777 7,532
Pension expense 1,826 3,277
Contributions to pension plan (6,000)
Changes in operating assets and liabilities:    
Accounts receivable - net 2,082 (6,060)
Inventories - net 7,267 1,510
Accounts payable 769 (11)
Commissions payable 2,662 (40)
Deferred revenue (1,380) (1,999)
Prepaid income taxes 2,076 (435)
Payroll and benefit obligations 717 (213)
Accrued expenses and other 2,893 49
Net cash provided by operating activities 33,591 17,514
Cash flows from investing activities:    
Capital additions - net (2,547) (4,104)
Acquisition, net of cash acquired 34
Net cash used for investing activities (2,547) (4,070)
Cash dividends (5,478) (5,252)
Payments to bank for borrowings (6,000)
Net cash used for financing activities (5,478) (11,252)
Effect of exchange rate changes on cash 251 (694)
Net increase in cash and cash equivalents 25,817 1,498
Cash and cash equivalents:    
Beginning of period 23,724 24,491
End of period $ 49,541 $ 25,989