Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 30,491	$ 18,615
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,884	11,406
Pension expense	4,301	5,696
Contributions to pension plan	(4,000)	(2,000)
Impairment of goodwill and other intangible assets		4,098
Changes in operating assets and liabilities:
Accounts receivable, net	(5,962)	4,570
Inventories, net	(7,811)	(3,377)
Accounts payable	1,857	(278)
Commissions payable	3,062	(4,593)
Income taxes	(2,738)	909
Accrued expenses and other	481	(4,975)
Benefit obligations	5,980	3,341
Net cash provided by operating activities	36,545	33,412
Cash used for investing activities:
Capital additions	(7,647)	(4,840)
Proceeds from sale of property, plant and equipment	791	294
Proceeds (purchases) of short-term investments, net	2,968	(2,975)
Net cash used for investing activities	(3,888)	(7,521)
Cash used for financing activities:
Cash dividends	(9,791)	(9,004)
Other	459
Net cash used for financing activities	(10,250)	(9,004)
Effect of exchange rate changes on cash	(706)	1,467
Net increase in cash and cash equivalents	21,701	18,354
Cash and cash equivalents:
Beginning of period	79,680	57,604
End of period	$ 101,381	$ 75,958