CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Total revenues	$ 631,293	$ 574,420
Cost of revenues	553,428	540,328
Gross profit	77,865	34,092
Selling, administrative and general expenses	66,763	66,119
Gain on sale of property, plant & equipment and businesses, net	6,375	236,364
Restructuring charges	(2,818)	0
Other operating expense, net	(3,900)	(9,668)
Operating earnings	10,759	194,669
Other nonoperating income, net	979	2,825
Interest expense, net	(62,480)	(120,089)
Earnings (loss) from continuing operations before income taxes	(50,742)	77,405
Provision for (benefit from) income taxes	(14,075)	22,900
Earnings (loss) from continuing operations	(36,667)	54,505
Loss on discontinued operations, net of tax	(3,011)	(510)
Net earnings (loss)	(39,678)	53,995
Other comprehensive income, net of tax
Reclassification adjustment for cash flow hedges	2,248	2,985
Adjustment for funded status of benefit plans	0	2,942
Amortization of actuarial loss and prior service cost for benefit plans	2,681	(1,222)
Other comprehensive income	4,929	4,705
Comprehensive income (loss)	(34,749)	58,700
Basic earnings (loss) per share
Continuing operations	$ (0.28)	$ 0.42
Discontinued operations	$ (0.02)	$ (0.01)
Net earnings (loss)	$ (0.30)	$ 0.41
Diluted earnings (loss) per share
Continuing operations	$ (0.28)	$ 0.41
Discontinued operations	$ (0.02)	$ 0.00
Net earnings (loss)	$ (0.30)	$ 0.41
Weighted-average common shares outstanding
Basic	132,659	130,810
Assuming dilution	132,659	132,314
Cash dividends per share of common stock	$ 0.10	$ 0.05
Depreciation, depletion, accretion and amortization	$ 66,723	$ 69,378
Effective tax rate from continuing operations	27.70%	29.60%