CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues:
Sales	$ 685,052	$ 460,163	$ 1,858,343	$ 1,173,982
Miscellaneous income	5,017	4,099	13,460	12,951
Total revenues	690,069	464,262	1,871,803	1,186,933
Costs and expenses:
Cost of sales (exclusive of depreciation and depletion)	425,487	200,498	1,106,008	574,095
Depreciation and depletion	63,046	25,905	180,830	71,959
Selling, general and administrative	43,122	19,703	132,525	60,453
Postretirement benefits	9,764	10,369	30,374	31,099
Total costs and expenses	541,419	256,475	1,449,737	737,606
Operating income	148,650	207,787	422,066	449,327
Interest expense	(27,642)	(4,179)	(63,245)	(13,120)
Interest income	40	175	356	633
Other income (loss), net	(13,143)		11,360
Income from continuing operations before income tax expense	107,905	203,783	370,537	436,840
Income tax expense	31,684	66,811	105,145	141,063
Income from continuing operations	76,221	136,972	265,392	295,777
Loss from discontinued operations		(757)		(1,848)
Net income	$ 76,221	$ 136,215	$ 265,392	$ 293,929
Basic income per share:
Income from continuing operations (in dollars per share)	$ 1.22	$ 2.59	$ 4.45	$ 5.56
Discontinued operations (in dollars per share)		$ (0.02)		$ (0.04)
Net income (in dollars per share)	$ 1.22	$ 2.57	$ 4.45	$ 5.52
Diluted income per share:
Income from continuing operations (in dollars per share)	$ 1.21	$ 2.57	$ 4.43	$ 5.50
Discontinued operations (in dollars per share)		$ (0.02)		$ (0.03)
Net income (in dollars per share)	$ 1.21	$ 2.55	$ 4.43	$ 5.47
Dividends per share (in dollars per share)	$ 0.125	$ 0.125	$ 0.375	$ 0.35