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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income $ 17,702 $ 19,790
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 7,095 7,210
Pension expense 1,411 3,660
Contributions to pension plan (4,000)
Stock based compensation 474 606
Changes in operating assets and liabilities:    
Accounts receivable, net (7,707) (7,254)
Inventories, net 8,765 (5,214)
Accounts payable (2,396) 966
Commissions payable (836) 1,025
Deferred revenue and customer deposits 2,028 (765)
Income taxes 1,577 (3,839)
Accrued expenses and other (900) (2,727)
Benefit obligations (725) 4,879
Net cash provided by operating activities 26,488 14,337
Cash used for investing activities:    
Capital additions (3,464) (5,479)
Proceeds (purchases) of short-term investments, net (2) 2,969
Net cash used for investing activities (3,466) (2,510)
Cash used for financing activities:    
Cash dividends (7,053) (6,527)
Other (452) (459)
Net cash used for financing activities (7,505) (6,986)
Effect of exchange rate changes on cash 190 (800)
Net increase in cash and cash equivalents 15,707 4,041
Cash and cash equivalents:    
Beginning of period 46,458 79,680
End of period $ 62,165 $ 83,721