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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income $ 12,913 $ 12,902
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 7,433 7,777
Pension expense 4,696 1,826
Contributions to pension plan (2,000) (6,000)
Changes in operating assets and liabilities:    
Accounts receivable, net (649) 2,082
Inventories, net 3,227 7,267
Accounts payable 461 769
Commissions payable (3,642) 2,662
Deferred revenue (340) (1,380)
Income taxes 3,227 2,076
Accrued expenses and other (2,347) 2,893
Benefit obligations 1,008 717
Net cash provided by operating activities 23,987 33,591
Cash used for investing activities:    
Capital additions (3,345) (2,547)
Purchases of short-term investments (5,999)
Net cash used for investing activities (9,344) (2,547)
Cash used for financing activities, cash dividends (6,002) (5,478)
Effect of exchange rate changes on cash 729 251
Net increase in cash and cash equivalents 9,370 25,817
Cash and cash equivalents:    
Beginning of period 57,604 23,724
End of period $ 66,974 $ 49,541