CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Sales	$ 2,381,760	$ 2,562,325	$ 1,570,845
Miscellaneous income	18,135	9,033	16,885
Total revenues	2,399,895	2,571,358	1,587,730
Costs and expenses:
Cost of sales (exclusive of depreciation and depletion)	1,796,991	1,561,112	766,516
Depreciation and depletion	316,232	230,681	98,702
Selling, general and administrative	133,467	165,749	86,972
Postretirement benefits	52,852	40,385	41,478
Asset impairment and restructuring	49,070
Goodwill impairment	1,064,409
Total costs and expenses	3,413,021	1,997,927	993,668
Operating income (loss)	(1,013,126)	573,431	594,062
Interest expense	(139,356)	(96,820)	(17,250)
Interest income	804	606	784
Other income (loss), net	(13,081)	17,606
Income (loss) from continuing operations before income tax expense	(1,164,759)	494,823	577,596
Income tax expense (benefit)	(99,204)	131,225	188,171
Income (loss) from continuing operations	(1,065,555)	363,598	389,425
Income (loss) from discontinued operations	5,180		(3,628)
Net income (loss)	$ (1,060,375)	$ 363,598	$ 385,797
Basic income (loss) per share:
Income (loss) from continuing operations (in dollars per share)	$ (17.04)	$ 6.03	$ 7.32
Income (loss) from discontinued operations (in dollars per share)	$ 0.08		$ (0.07)
Net income (loss) (in dollars per share)	$ (16.96)	$ 6.03	$ 7.25
Diluted income (loss) per share:
Income (loss) from continuing operations (in dollars per share)	$ (17.04)	$ 6.00	$ 7.25
Income (loss) from discontinued operations (in dollars per share)	$ 0.08		$ (0.07)
Net income (loss) (in dollars per share)	$ (16.96)	$ 6.00	$ 7.18