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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 18,615 $ 19,829
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 11,406 11,604
Pension expense 5,696 2,737
Pension contributions (2,000) (8,000)
Impairment of goodwill and other intangible assets 4,098
Gain on sale of property, plant and equipment (48) (974)
Changes in operating assets and liabilities:    
Accounts receivable, net 4,570 2,869
Inventories, net (3,377) 8,294
Accounts payable (278) 467
Commissions payable (4,593) 3,260
Deferred revenue (810) 492
Income taxes 909 (568)
Accrued expenses and other (4,117) 9,776
Benefit obligations 3,341 2,423
Net cash provided by operating activities 33,412 52,209
Cash used for investing activities:    
Capital additions (4,840) (5,613)
Proceeds from sale of property, plant and equipment 294 1,284
Purchase of short-term investments, net (2,975)
Net cash used for investing activities (7,521) (4,329)
Cash used for financing activities, cash dividends (9,004) (8,217)
Effect of exchange rate changes on cash 1,467 294
Net increase in cash and cash equivalents 18,354 39,957
Cash and cash equivalents:    
Beginning of period 57,604 23,724
End of period $ 75,958 $ 63,681