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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 19,790 $ 12,913
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 7,210 7,433
Pension expense 3,660 4,696
Contributions to pension plan (4,000) (2,000)
Changes in operating assets and liabilities:    
Accounts receivable, net (7,254) (649)
Inventories, net (5,214) 3,227
Accounts payable 966 461
Commissions payable 1,025 (3,642)
Income taxes (3,839) 3,227
Accrued expenses and other (2,886) (2,687)
Benefit obligations 4,879 1,008
Net cash provided by operating activities 14,337 23,987
Cash used for investing activities:    
Capital additions (5,479) (3,345)
Proceeds (purchases) of short-term investments, net 2,969 (5,999)
Net cash used for investing activities (2,510) (9,344)
Cash used for financing activities:    
Cash dividends (6,527) (6,002)
Other 459
Net cash used for financing activities (6,986) (6,002)
Effect of exchange rate changes on cash (800) 729
Net increase in cash and cash equivalents 4,041 9,370
Cash and cash equivalents:    
Beginning of period 79,680 57,604
End of period $ 83,721 $ 66,974