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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 9,617 $ 5,065
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,600 3,754
Pension expense 879 2,394
Changes in operating assets and liabilities:    
Accounts receivable, net 2,658 (5,905)
Inventories, net (3,892) 1,323
Accounts payable 359 436
Commissions payable 354 (1,242)
Deferred revenue and customer deposits 869 147
Income taxes 3,014 2,929
Accrued expenses and other (1,493) 717
Benefit obligations (1,443) (2,018)
Net cash provided by operating activities 14,522 7,600
Cash used for investing activities, capital additions (2,033) (1,950)
Cash used for financing activities:    
Cash dividends (3,263) (3,001)
Other 371
Net cash used for financing activities (3,634) (3,001)
Effect of exchange rate changes on cash (146) 198
Net increase in cash and cash equivalents 8,709 2,847
Cash and cash equivalents:    
Beginning of period 79,680 57,604
End of period $ 88,389 $ 60,451