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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income $ 19,829,000 $ 19,797,000
Adjustments to reconcile net income attributable to net cash provided by operating activities:    
Depreciation and amortization 11,604,000 11,356,000
Pension expense 2,737,000 6,157,000
Contributions to pension plan (8,000,000)
Gain on sale of property, plant and equipment (974,000) (8,000)
Changes in operating assets and liabilities:    
Accounts receivable - net 2,869,000 (2,536,000)
Inventories - net 8,294,000 12,604,000
Accounts payable 467,000 (2,195,000)
Commissions payable 3,260,000 260,000
Deferred revenue 492,000 (1,974,000)
Prepaid income taxes (568,000) 1,952,000
Payroll and benefit obligations 2,423,000 1,464,000
Accrued expenses and other 9,776,000 (1,975,000)
Net cash provided by operating activities 52,209,000 44,902,000
Cash flows from investing activities:    
Capital additions - net (5,613,000) (6,897,000)
Proceeds from sale of property, plant and equipment 1,284,000 250,000
Acquisition, net of cash acquired (3,386,000)
Net cash used for investing activities (4,329,000) (10,033,000)
Cash dividends (8,217,000) (7,860,000)
Treasury stock purchase (4,579,000)
Payments to bank for borrowings (12,044,000)
Net cash used for financing activities (8,217,000) (24,483,000)
Effect of exchange rate changes on cash 294,000 (1,055,000)
Net increase in cash and cash equivalents 39,957,000 9,331,000
Cash and cash equivalents:    
Beginning of period 23,724,000 24,491,000
End of period $ 63,681,000 $ 33,822,000