Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows provided by (used in) operating activities:
Net income	$ 75,548	$ 75,479
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	73,042	76,511
Rationalization charges	1,684	2,449
Loss on early extinguishment of debt	0	1,474
Excess tax benefit from stock-based compensation	(771)	(1,037)
Other changes that provided (used) cash:
Trade accounts receivable, net	(140,426)	(116,359)
Inventories	(212,806)	(234,603)
Trade accounts payable	38,630	42,724
Accrued liabilities	11,577	12,966
Other, net	16,764	(22,428)
Net cash used in operating activities	(136,758)	(162,824)
Cash flows provided by (used in) investing activities:
Purchase of business, net of cash acquired	(690)	0
Capital expenditures	(98,183)	(60,004)
Proceeds from asset sales	128	372
Net cash used in investing activities	(98,745)	(59,632)
Cash flows provided by (used in) financing activities:
Borrowings under revolving loans	585,364	678,872
Repayments under revolving loans	(169,284)	(340,779)
Proceeds from issuance of long-term debt	3,970	732,215
Repayments of long-term debt	(5,649)	(751,509)
Debt issuance costs	0	(5,019)
Changes in outstanding checks - principally vendors	(82,801)	(86,538)
Dividends paid on common stock	(20,113)	(19,356)
Excess tax benefit from stock-based compensation	771	1,037
Repurchase of common stock under stock plan	(2,538)	(5,267)
Repurchase of common stock under share repurchase authorization	(170,132)	(7,735)
Net cash provided by financing activities	139,588	195,921
Cash and cash equivalents:
Net decrease	(95,915)	(26,535)
Balance at beginning of year	222,591	160,463
Balance at end of period	126,676	133,928
Interest paid, net	31,560	33,762
Income taxes paid, net	$ 18,306	$ 25,056