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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 5,065 $ 6,282
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,754 3,872
Pension expense 2,394 913
Contributions to pension plan (2,000)
Changes in operating assets and liabilities:    
Accounts receivable, net (5,905) (1,301)
Inventories, net 1,323 5,525
Accounts payable 436 2,947
Commissions payable (1,242) 1,424
Deferred revenue (291) (104)
Income taxes 2,929 2,736
Accrued expenses and other 1,155 (1,911)
Benefit obligations (2,018) 1,727
Net cash provided by operating activities 7,600 20,110
Cash used for investing activities, capital additions (1,950) (1,212)
Cash used for financing activities, cash dividends (3,001) (2,739)
Effect of exchange rate changes on cash 198 308
Net increase in cash and cash equivalents 2,847 16,467
Cash and cash equivalents:    
Beginning of period 57,604 23,724
End of period $ 60,451 $ 40,191