CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Total revenues	$ 754,728,000	$ 631,293,000
Cost of revenues	590,010,000	553,428,000
Gross profit	164,718,000	77,865,000
Selling, administrative and general expenses	76,468,000	66,763,000
Gain on sale of property, plant & equipment and businesses	555,000	6,375,000
Impairment of long-lived assets	(9,646,000)	0
Restructuring charges	(320,000)	(2,818,000)
Other operating expense, net	(13,918,000)	(3,900,000)
Operating earnings	64,921,000	10,759,000
Other nonoperating income (expense), net	(694,000)	979,000
Interest expense, net	(33,732,000)	(62,480,000)
Earnings (loss) from continuing operations before income taxes	30,495,000	(50,742,000)
Provision for (benefit from) income taxes	9,764,000	(14,075,000)
Earnings (loss) from continuing operations	20,731,000	(36,667,000)
Loss on discontinued operations, net of tax	(1,807,000)	(3,011,000)
Net earnings (loss)	18,924,000	(39,678,000)
Other comprehensive income, net of tax
Reclassification adjustment for cash flow hedges	294,000	2,248,000
Amortization of actuarial loss and prior service cost for benefit plans	20,000	2,681,000
Other comprehensive income	314,000	4,929,000
Comprehensive income (loss)	$ 19,238,000	$ (34,749,000)
Basic earnings (loss) per share
Continuing operations	$ 0.15	$ (0.28)
Discontinued operations	(0.01)	(0.02)
Net earnings (loss)	0.14	(0.30)
Diluted earnings (loss) per share
Continuing operations	0.15	(0.28)
Discontinued operations	(0.01)	(0.02)
Net earnings (loss)	$ 0.14	$ (0.30)
Weighted-average common shares outstanding
Basic	133,821	132,659
Assuming dilution	135,452	132,659
Cash dividends per share of common stock	$ 0.20	$ 0.10
Depreciation, depletion, accretion and amortization	$ 69,406,000	$ 66,723,000
Effective tax rate from continuing operations	32.00%	27.70%