Condensed Consolidated Statements of Comprehensive Income (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statements of Comprehensive Income [Abstract]
Net sales	$ 696,078,000	$ 648,890,000	$ 1,200,632,000	$ 1,148,741,000
Delivery revenues	42,655,000	45,246,000	76,263,000	81,277,000
Total revenues	738,733,000	694,136,000	1,276,895,000	1,230,018,000
Cost of goods sold	563,183,000	542,951,000	1,050,082,000	1,020,844,000
Delivery costs	42,655,000	45,246,000	76,263,000	81,277,000
Cost of revenues	605,838,000	588,197,000	1,126,345,000	1,102,121,000
Gross profit	132,895,000	105,939,000	150,550,000	127,897,000
Selling, administrative and general expenses	64,902,000	61,914,000	129,557,000	126,826,000
Gain on sale of property, plant & equipment and businesses, net	23,410,000	13,152,000	27,520,000	19,678,000
Restructuring charges	0	(4,551,000)	(1,509,000)	(5,962,000)
Exchange offer costs	0	(32,060,000)	0	(42,125,000)
Other operating income (expense), net	(4,537,000)	(904,000)	(10,196,000)	720,000
Operating earnings (loss)	86,866,000	19,662,000	36,808,000	(26,618,000)
Other nonoperating income (expense), net	286,000	(709,000)	2,658,000	2,391,000
Interest income expense, nonoperating, net	50,873,000	53,687,000	103,623,000	105,954,000
Earnings (loss) from continuing operations before income taxes	36,279,000	(34,734,000)	(64,157,000)	(130,181,000)
Provision for (benefit from) income taxes	6,151,000	(17,749,000)	(32,666,000)	(56,145,000)
Earnings (loss) from continuing operations	30,128,000	(16,985,000)	(31,491,000)	(74,036,000)
Earnings (loss) on discontinued operations, net of tax	(1,356,000)	(1,298,000)	5,427,000	3,700,000
Net earnings (loss)	28,772,000	(18,283,000)	(26,064,000)	(70,336,000)
Other comprehensive income, net of tax
Reclassification adjustment for cash flow hedges	835,000	955,000	1,689,000	1,893,000
Adjustment for funded status of pension plans	60,299,000	0	60,299,000	0
Amortization of pension and postretirement benefit plans actuarial loss and prior service cost	3,431,000	3,084,000	6,863,000	6,168,000
Other comprehensive income	64,565,000	4,039,000	68,851,000	8,061,000
Comprehensive income (loss)	93,337,000	(14,244,000)	42,787,000	(62,275,000)
Basic earnings (loss) per share
Continuing operations	$ 0.23	$ (0.13)	$ (0.24)	$ (0.57)
Discontinued operations	$ (0.01)	$ (0.01)	$ 0.04	$ 0.03
Net earnings (loss) per share	$ 0.22	$ (0.14)	$ (0.20)	$ (0.54)
Diluted earnings (loss) per share
Continuing operations	$ 0.23	$ (0.13)	$ (0.24)	$ (0.57)
Discontinued operations	$ (0.01)	$ (0.01)	$ 0.04	$ 0.03
Net earnings (loss) per share	$ 0.22	$ (0.14)	$ (0.20)	$ (0.54)
Weighted-average common shares outstanding
Basic	130,250	129,676	130,219	129,634
Assuming dilution	131,332	129,676	130,219	129,634
Cash dividends per share of common stock	$ 0.01	$ 0.01	$ 0.02	$ 0.02
Depreciation, depletion, accretion and amortization	$ 76,961,000	$ 84,116,000	$ 152,557,000	$ 169,283,000
Effective tax rate from continuing operations	17.00%	51.10%	50.90%	43.10%