CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating Activities
Net earnings (loss)	$ 99,963,000	$ (26,064,000)
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation, depletion, accretion and amortization	137,702,000	152,557,000
Net gain on sale of property, plant & equipment and businesses	(237,526,000)	(40,550,000)
Contributions to pension plans	(2,791,000)	(2,308,000)
Share-based compensation	11,928,000	11,102,000
Excess tax benefits from share-based compensation	(3,242,000)	(888,000)
Deferred tax provision (benefit)	24,000	(31,581,000)
Cost of debt purchase	72,949,000	0
Changes in assets and liabilities before initial effects of business acquisitions and dispositions	(59,893,000)	(108,295,000)
Other, net	3,786,000	682,000
Net cash provided by (used for) operating activities	22,900,000	(45,345,000)
Investing Activities
Purchases of property, plant & equipment	(116,312,000)	(60,041,000)
Proceeds from sale of property, plant & equipment	20,454,000	2,517,000
Proceeds from sale of businesses, net of transaction costs	719,089,000	52,908,000
Payment for businesses acquired, net of acquired cash	(207,000)	(89,951,000)
Increase in restricted cash	(62,087,000)	0
Other, net	0	2,000
Net cash provided by (used for) investing activities	560,937,000	(94,565,000)
Financing Activities
Proceeds from line of credit	0	111,000,000
Payment of current maturities, long-term debt and line of credit	(579,694,000)	(161,477,000)
Proceeds from issuance of common stock	27,539,000	0
Dividends paid	(13,074,000)	(2,598,000)
Proceeds from exercise of stock options	12,095,000	3,598,000
Excess tax benefits from share-based compensation	3,242,000	888,000
Other, net	1,000	0
Net cash used for financing activities	(549,891,000)	(48,589,000)
Net increase (decrease) in cash and cash equivalents	33,946,000	(188,499,000)
Cash and cash equivalents at beginning of year	193,738,000	275,478,000
Cash and cash equivalents at end of period	$ 227,684,000	$ 86,979,000