Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Net income	$ 33,992	$ 38,818
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	25,100	23,677
Loss (gain) on disposition of property, plant and equipment	91	(158)
Stock compensation expense	3,021	2,501
Changes in assets and liabilities:
Accounts receivable	4,345	(26,841)
Inventories	7,300	(13,920)
Prepaid expenses and other current assets	(2,670)	(6,028)
Accounts payable	(9,179)	4,488
Accrued liabilities	(4,708)	10,494
Deferred income taxes	(872)	(66)
Long-term retirement benefits	(3,428)	(2,213)
Other	68	(269)
Net cash provided by operating activities	53,060	30,483
Investing activities:
Proceeds from disposition of property, plant and equipment	322	552
Capital expenditures	(13,738)	(11,210)
Other	0	(1,000)
Net cash used by investing activities	(13,416)	(11,658)
Financing activities:
Net change in other borrowings	20,903	9,169
Payments on long-term debt	(152,195)	(111,845)
Proceeds from the issuance of long-term debt	102,990	87,500
Proceeds from the issuance of common stock	986	317
Common stock repurchases	0	(33,541)
Dividends paid	(8,217)	(7,453)
Withholding taxes paid on stock issuances	(80)	(68)
Other	(1,340)	(6,546)
Net cash used by financing activities	(36,953)	(62,467)
Effect of exchange rate changes on cash flows	97	3,053
Increase (decrease) in cash and cash equivalents	2,788	(40,589)
Cash and cash equivalents at beginning of period	100,719	145,290
Cash and cash equivalents at end of period	$ 103,507	$ 104,701