Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows provided by (used in) operating activities:
Net income	$ 129,655	$ 145,866
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	110,280	109,790
Rationalization charges	13,929	10,754
Stock compensation expense	9,724	9,098
Other changes that provided (used) cash:
Trade accounts receivable, net	(231,674)	(325,281)
Inventories	(6,546)	(43,721)
Trade accounts payable	(60,423)	8,555
Accrued liabilities	34,371	22,272
Other, net	(10,885)	15,170
Net cash used in operating activities	(11,569)	(47,497)
Cash flows provided by (used in) investing activities:
Purchase of business, net of cash acquired	0	(690)
Capital expenditures	(151,522)	(151,419)
Proceeds from asset sales	8,926	225
Net cash used in investing activities	(142,596)	(151,884)
Cash flows provided by (used in) financing activities:
Borrowings under revolving loans	601,558	692,476
Repayments under revolving loans	(303,259)	(326,026)
Proceeds from issuance of long-term debt	0	7,327
Repayments of long-term debt	(7,775)	(7,040)
Changes in outstanding checks - principally vendors	(101,765)	(82,801)
Dividends paid on common stock	(31,344)	(29,919)
Repurchase of common stock under stock plan	(2,434)	(2,892)
Repurchase of common stock under share repurchase authorization	(7,200)	(170,132)
Net cash provided by financing activities	147,781	80,993
Cash and cash equivalents:
Net decrease	(6,384)	(118,388)
Balance at beginning of year	99,945	222,591
Balance at end of period	93,561	104,203
Interest paid, net	46,899	45,541
Income taxes paid, net	$ 46,206	$ 37,546