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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 7,222 $ 9,617
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,566 3,600
Pension expense 659 879
Stock based compensation 55 237
Changes in operating assets and liabilities:    
Accounts receivable, net 1,940 2,658
Inventories, net 1,893 (3,892)
Accounts payable (342) 359
Commissions payable (1,866) 354
Deferred revenue and customer deposits 768 869
Income taxes 714 3,014
Accrued expenses and other (2,122) (1,730)
Benefit obligations (2,828) (1,443)
Net cash provided by operating activities 9,659 14,522
Cash used for investing activities, capital additions (2,124) (2,033)
Cash used for financing activities:    
Cash dividends (3,526) (3,263)
Other (417) (371)
Net cash used for financing activities (3,943) (3,634)
Effect of exchange rate changes on cash 127 (146)
Net increase in cash and cash equivalents 3,719 8,709
Cash and cash equivalents:    
Beginning of period 46,458 79,680
End of period $ 50,177 $ 88,389