CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net sales	$ 2,033,693	$ 2,373,280	$ 6,099,161	$ 7,108,189
Cost of sales	1,541,705	1,956,480	4,633,223	5,876,126
Gross profit	491,988	416,800	1,465,938	1,232,063
Operating costs and expenses:
Selling and distribution	347,493	337,346	1,023,769	1,011,657
General and administrative	84,916	69,728	259,635	212,804
Amortization of intangibles	6,401	714	15,313	2,175
Facility closing and reorganization costs	2,709	2,805	9,362	4,510
Impairment of intangible assets	0	0	109,910	0
Litigation settlements	0	0	0	(2,521)
Impairment of long-lived assets	0	7,400	0	7,400
Other operating income	0	0	0	(4,535)
Total operating costs and expenses	441,519	417,993	1,417,989	1,231,490
Operating income (loss)	50,469	(1,193)	47,949	573
Other (income) expense:
Interest expense	17,003	15,233	50,505	45,477
Loss on early retirement of long- term debt	0	0	43,609	0
Other income, net	(964)	(487)	(1,704)	(760)
Total other expense	16,039	14,746	92,410	44,717
Income (loss) from continuing operations before income taxes	34,430	(15,939)	(44,461)	(44,144)
Income tax expense (benefit)	14,197	(803)	(17,562)	(18,253)
Income (loss) from continuing operations	20,233	(15,136)	(26,899)	(25,891)
Loss from discontinued operations, net of tax	0	(836)	0	(836)
Gain (loss) on sale of discontinued operations, net of tax	0	0	(89)	1,154
Net income (loss)	$ 20,233	$ (15,972)	$ (26,988)	$ (25,573)
Average common shares:
Basic (in shares)	93,254,547	93,797,183	93,950,693	93,916,848
Diluted (in shares)	93,816,178	93,797,183	93,950,693	93,916,848
Basic income (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	$ 0.22	$ (0.16)	$ (0.29)	$ (0.28)
Income (loss) from discontinued operations (in dollars per share)	0.00	(0.01)	0.00	0.01
Net income (loss) (in dollars per share)	0.22	(0.17)	(0.29)	(0.27)
Diluted income (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	0.22	(0.16)	(0.29)	(0.28)
Income (loss) from discontinued operations (in dollars per share)	0.00	(0.01)	0.00	0.01
Net income (loss) (in dollars per share)	0.22	(0.17)	(0.29)	(0.27)
Cash dividends declared per common share (in dollars per share)	$ 0.07	$ 0.07	$ 0.21	$ 0.21