Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows provided by (used in) operating activities:
Net income	$ 59,886	$ 75,548
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	73,019	73,042
Rationalization charges	6,108	1,684
Stock compensation expense	6,428	6,069
Other changes that provided (used) cash:
Trade accounts receivable, net	(111,600)	(140,426)
Inventories	(176,427)	(212,806)
Trade accounts payable	(10,701)	38,630
Accrued liabilities	(14,431)	11,577
Other, net	5,067	10,695
Net cash used in operating activities	(162,651)	(135,987)
Cash flows provided by (used in) investing activities:
Purchase of business, net of cash acquired	0	(690)
Capital expenditures	(111,714)	(98,183)
Proceeds from asset sales	8,822	128
Net cash used in investing activities	(102,892)	(98,745)
Cash flows provided by (used in) financing activities:
Borrowings under revolving loans	531,544	585,364
Repayments under revolving loans	(114,207)	(169,284)
Proceeds from issuance of long-term debt	0	3,970
Repayments of long-term debt	(6,380)	(5,649)
Changes in outstanding checks - principally vendors	(101,765)	(82,801)
Dividends paid on common stock	(20,913)	(20,113)
Repurchase of common stock under stock plan	(2,204)	(2,538)
Repurchase of common stock under share repurchase authorization	(10)	(170,132)
Net cash provided by financing activities	286,065	138,817
Cash and cash equivalents:
Net increase (decrease)	20,522	(95,915)
Balance at beginning of year	99,945	222,591
Balance at end of period	120,467	126,676
Interest paid, net	32,269	31,560
Income taxes paid, net	$ 43,707	$ 18,306