CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 1,964,601	$ 2,033,693	$ 5,692,217	$ 6,099,161
Cost of sales	1,475,826	1,541,705	4,206,121	4,633,223
Gross profit	488,775	491,988	1,486,096	1,465,938
Operating costs and expenses:
Selling and distribution	341,477	347,493	1,005,514	1,023,769
General and administrative	90,840	84,916	262,605	259,635
Amortization of intangibles	5,151	6,401	15,596	15,313
Facility closing and reorganization costs, net	9,297	2,709	9,063	9,362
Impairment of intangible assets	0	0	0	109,910
Total operating costs and expenses	446,765	441,519	1,292,778	1,417,989
Operating income	42,010	50,469	193,318	47,949
Other (income) expense:
Interest expense	16,564	17,003	50,270	50,505
Loss on early retirement of long-term debt	0	0	0	43,609
Other income, net	(1,178)	(964)	(4,385)	(1,704)
Total other expense	15,386	16,039	45,885	92,410
Income (loss) from continuing operations before income taxes	26,624	34,430	147,433	(44,461)
Income tax expense (benefit)	12,098	14,197	60,335	(17,562)
Income (loss) from continuing operations	14,526	20,233	87,098	(26,899)
Loss on sale of discontinued operations, net of tax	0	0	0	(89)
Net income (loss)	$ 14,526	$ 20,233	$ 87,098	$ (26,988)
Average common shares:
Basic (in shares)	90,423,466	93,254,547	91,076,741	93,950,693
Diluted (in shares)	90,965,375	93,816,178	91,694,838	93,950,693
Basic income (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	$ 0.16	$ 0.22	$ 0.96	$ (0.29)
Loss from discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00
Net income (loss) (in dollars per share)	0.16	0.22	0.96	(0.29)
Diluted income (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	0.16	0.22	0.95	(0.29)
Loss from discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00
Net income (loss) (in dollars per share)	0.16	0.22	0.95	(0.29)
Cash dividends declared per common share (in dollars per share)	$ 0.09	$ 0.07	$ 0.27	$ 0.21