Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows provided by (used in) operating activities:
Net income	$ 45,721	$ 23,232
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	48,931	37,572
Rationalization charges	703	885
Stock compensation expense	3,700	3,279
Loss on early extinguishment of debt	0	2,677
Other changes that provided (used) cash:
Trade accounts receivable, net	(49,615)	(41,452)
Inventories	(74,451)	(107,446)
Trade accounts payable	(16,077)	(36,806)
Accrued liabilities	(41,215)	(17,583)
Other, net	(7,816)	(5,287)
Net cash used in operating activities	(90,119)	(140,929)
Cash flows provided by (used in) investing activities:
Capital expenditures	(49,196)	(38,893)
Other, net	800	386
Net cash used in investing activities	(48,396)	(38,507)
Cash flows provided by (used in) financing activities:
Borrowings under revolving loans	444,595	655,633
Repayments under revolving loans	(79,821)	(508,865)
Proceeds from issuance of long-term debt	0	989,200
Repayments of long-term debt	(4,638)	(521,666)
Changes in outstanding checks - principally vendors	(87,795)	(78,946)
Dividends paid on common stock	(11,333)	(10,115)
Debt issuance costs	0	(16,643)
Repurchase of common stock under stock plan	(2,746)	(3,231)
Net cash provided by financing activities	258,262	505,367
Effect of exchange rate changes on cash and cash equivalents	1,260	0
Cash and cash equivalents:
Net increase	121,007	325,931
Balance at beginning of year	53,533	24,690
Balance at end of period	174,540	350,621
Interest paid, net	39,953	12,234
Income taxes paid, net	$ 21,835	$ 8,065