Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities:
Net income	$ 38,818	$ 38,303
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,677	21,366
Gain on disposition of property, plant and equipment	(158)	(46)
Stock compensation expense	2,501	2,490
Changes in assets and liabilities:
Accounts receivable	(26,841)	(15,252)
Inventories	(13,920)	(7,329)
Prepaid expenses and other current assets	(6,028)	734
Accounts payable	4,488	8,064
Accrued liabilities	10,494	5,117
Deferred income taxes	(66)	(705)
Long-term retirement benefits	(2,213)	(1,812)
Other	(269)	906
Net cash provided by operating activities	30,483	51,836
Investing activities:
Proceeds from disposition of property, plant and equipment	552	170
Capital expenditures	(11,210)	(11,727)
Other	1,000	0
Net cash used by investing activities	(11,658)	(11,557)
Financing activities:
Net change in other borrowings	9,169	(24,947)
Payments on long-term debt	(111,845)	(24,768)
Proceeds from the issuance of long-term debt	87,500	47,550
Proceeds from the issuance of common stock	317	379
Common stock repurchases	(33,541)	(5,383)
Dividends paid	(7,453)	(6,997)
Withholding taxes paid on stock issuances	(68)	(106)
Other	(6,546)	(5,828)
Net cash used by financing activities	(62,467)	(20,100)
Effect of exchange rate changes on cash flows	3,053	1,657
(Decrease) increase in cash and cash equivalents	(40,589)	21,836
Cash and cash equivalents at beginning of period	145,290	66,447
Cash and cash equivalents at end of period	$ 104,701	$ 88,283