Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows provided by (used in) operating activities:
Net income	$ 153,351	$ 172,413	$ 182,391
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	143,058	142,192	148,089
Amortization of debt issuance costs	4,139	4,156	4,202
Rationalization charges	19,061	14,407	14,481
Stock compensation expense	13,018	12,077	12,425
Loss on early extinguishment of debt	0	0	1,474
Deferred income tax (benefit) provision	45,011	(13,278)	38,756
Other changes that provided (used) cash, net of effects from acquisitions:
Trade accounts receivable, net	(10,867)	12,287	3,652
Inventories	19,960	(97,576)	(54,002)
Trade accounts payable	52,752	43,822	86,357
Accrued liabilities	(20,145)	37,640	(8,336)
Other, net	(24,787)	7,625	(81,245)
Net cash provided by operating activities	394,551	335,765	348,244
Cash flows provided by (used in) investing activities:
Purchases of businesses, net of cash acquired	0	(690)	(17,714)
Capital expenditures	(191,893)	(237,302)	(140,429)
Proceeds from asset sales	11,555	903	1,273
Net cash used in investing activities	(180,338)	(237,089)	(156,870)
Cash flows provided by (used in) financing activities:
Borrowings under revolving loans	919,482	732,091	781,022
Repayments under revolving loans	(797,106)	(729,843)	(805,565)
Changes in outstanding checks – principally vendors	(22,819)	18,961	(3,732)
Proceeds from issuance of long-term debt	0	7,538	733,629
Repayments of long-term debt	(67,412)	(37,304)	(754,834)
Debt issuance costs	0	0	(5,019)
Dividends paid on common stock	(40,877)	(39,741)	(38,624)
Repurchase of common stock under stock plan	(3,430)	(2,892)	(11,457)
Repurchase of common stock under share repurchase authorization	(277,306)	(170,132)	(24,666)
Net cash used in financing activities	(289,468)	(221,322)	(129,246)
Cash and cash equivalents:
Net (decrease) increase	(75,255)	(122,646)	62,128
Balance at beginning of year	99,945	222,591	160,463
Balance at end of year	24,690	99,945	222,591
Interest paid, net	65,471	63,954	69,747
Income taxes paid, net of refunds	$ 58,147	$ 49,690	$ 66,296