CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net sales	$ 756,289	$ 696,078	$ 1,304,785	$ 1,200,632
Delivery revenues	34,854	42,655	60,778	76,263
Total revenues	791,143	738,733	1,365,563	1,276,895
Cost of goods sold	581,501	563,183	1,095,904	1,050,082
Delivery costs	34,854	42,655	60,778	76,263
Cost of revenues	616,355	605,838	1,156,682	1,126,345
Gross profit	174,788	132,895	208,881	150,550
Selling, administrative and general expenses	67,615	64,902	133,733	129,557
Gain on sale of property, plant & equipment and businesses, net	1,162	23,410	237,526	27,520
Restructuring charges	0	0	0	(1,509)
Other operating expense, net	(5,089)	(4,537)	(14,758)	(10,196)
Operating earnings	103,246	86,866	297,916	36,808
Other nonoperating income, net	1,798	286	4,622	2,658
Interest expense, net	40,551	50,873	160,639	103,623
Earnings (loss) from continuing operations before income taxes	64,493	36,279	141,899	(64,157)
Provision for (benefit from) income taxes	17,982	6,151	40,882	(32,666)
Earnings (loss) from continuing operations	46,511	30,128	101,017	(31,491)
Earnings (loss) on discontinued operations, net of tax	(544)	(1,356)	(1,054)	5,427
Net earnings (loss)	45,967	28,772	99,963	(26,064)
Other comprehensive income, net of tax
Reclassification adjustment for cash flow hedges	584	835	3,569	1,689
Adjustment for funded status of benefit plans	0	60,299	2,943	60,299
Amortization of actuarial loss and prior service cost for benefit plans	1,115	3,431	(108)	6,863
Other comprehensive income	1,699	64,565	6,404	68,851
Comprehensive income	47,666	93,337	106,367	42,787
Basic earnings (loss) per share
Continuing operations	$ 0.35	$ 0.23	$ 0.77	$ (0.24)
Discontinued operations	$ 0.00	$ (0.01)	$ (0.01)	$ 0.04
Net earnings (loss)	$ 0.35	$ 0.22	$ 0.76	$ (0.20)
Diluted earnings (loss) per share
Continuing operations	$ 0.35	$ 0.23	$ 0.76	$ (0.24)
Discontinued operations	$ 0.00	$ (0.01)	$ (0.01)	$ 0.04
Net earnings (loss)	$ 0.35	$ 0.22	$ 0.75	$ (0.20)
Weighted-average common shares outstanding
Basic	131,149	130,250	130,980	130,219
Assuming dilution	132,876	131,332	132,468	130,219
Cash dividends per share of common stock	$ 0.05	$ 0.01	$ 0.10	$ 0.02
Depreciation, depletion, accretion and amortization	$ 68,323	$ 76,961	$ 137,702	$ 152,557
Effective tax rate from continuing operations	27.90%	17.00%	28.80%	50.90%