Supplemental Guarantor and Non-Guarantor Financial Information (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Sales	$ 445,937	$ 612,510	$ 1,373,344	$ 1,908,413
Miscellaneous income (loss)	9,859	(536)	15,291	12,698
Total revenues	455,796	611,974	1,388,635	1,921,111
Cost and expenses:
Cost of sales (exclusive of depreciation and depletion)	395,311	448,765	1,183,861	1,366,383
Depreciation and depletion	82,986	82,560	232,496	223,512
Selling, general and administrative	21,873	32,486	79,676	104,578
Postretirement benefits	14,707	13,213	44,157	39,639
Restructuring and asset impairment		1,106,715	1,699	1,106,715
Total costs and expenses	514,877	1,683,739	1,541,889	2,840,827
Operating income (loss)	(59,081)	(1,071,765)	(153,254)	(919,716)
Interest expense	(63,544)	(30,545)	(169,291)	(89,716)
Interest income	15	113	809	731
Other income (loss), net	4,886	(943)	4,277	(13,855)
Loss from continuing operations before income tax benefit	(117,724)	(1,103,140)	(317,459)	(1,022,556)
Income tax benefit	(17,000)	(41,184)	(132,799)	(27,972)
Loss from continuing operations	(100,724)	(1,061,956)	(184,660)	(994,584)
Income from discontinued operations				5,180
Net loss	(100,724)	(1,061,956)	(184,660)	(989,404)
Parent (Issuer)
Revenues:
Miscellaneous income (loss)	(932)	345	(159)	2,071
Total revenues	(932)	345	(159)	2,071
Cost and expenses:
Depreciation and depletion	543	466	1,539	901
Selling, general and administrative	(3,730)	6,026	6,420	14,594
Postretirement benefits	(54)	(112)	(164)	(337)
Total costs and expenses	(3,241)	6,380	7,795	15,158
Operating income (loss)	2,309	(6,035)	(7,954)	(13,087)
Interest expense	(72,054)	(35,618)	(190,227)	(111,043)
Interest income	1,874	1,124	5,419	2,868
Other income (loss), net	4,059	3,019	4,059	9,058
Loss from continuing operations before income tax benefit	(63,812)	(37,510)	(188,703)	(112,204)
Income tax benefit	(715)	(2,295)	(49,490)	(25,860)
Loss from continuing operations	(63,097)	(35,215)	(139,213)	(86,344)
Equity in earnings (losses) of subsidiaries	(37,627)	(1,026,741)	(45,447)	(903,060)
Net loss	(100,724)	(1,061,956)	(184,660)	(989,404)
Guarantor Subsidiaries
Revenues:
Sales	302,328	441,518	916,338	1,290,567
Miscellaneous income (loss)	5,669	1,674	8,638	20,553
Total revenues	307,997	443,192	924,976	1,311,120
Cost and expenses:
Cost of sales (exclusive of depreciation and depletion)	234,913	283,138	693,904	801,320
Depreciation and depletion	43,600	35,576	117,683	105,308
Selling, general and administrative	13,854	17,885	41,108	55,011
Postretirement benefits	14,761	13,325	44,321	39,976
Restructuring and asset impairment			(8,947)
Total costs and expenses	307,128	349,924	888,069	1,001,615
Operating income (loss)	869	93,268	36,907	309,505
Interest expense		(1,191)		(1,731)
Interest income	8,465	6,699	21,748	21,930
Other income (loss), net	218		218
Loss from continuing operations before income tax benefit	9,552	98,776	58,873	329,704
Income tax benefit	1,368	(1,632)	6,505	63,849
Loss from continuing operations	8,184	100,408	52,368	265,855
Net loss	8,184	100,408	52,368	265,855
Non-Guarantor Subsidiaries
Revenues:
Sales	143,609	170,992	457,006	617,846
Miscellaneous income (loss)	5,122	(2,555)	6,812	(9,926)
Total revenues	148,731	168,437	463,818	607,920
Cost and expenses:
Cost of sales (exclusive of depreciation and depletion)	160,398	165,627	489,957	565,063
Depreciation and depletion	38,843	46,518	113,274	117,303
Selling, general and administrative	11,749	8,575	32,148	34,973
Restructuring and asset impairment		1,106,715	10,646	1,106,715
Total costs and expenses	210,990	1,327,435	646,025	1,824,054
Operating income (loss)	(62,259)	(1,158,998)	(182,207)	(1,216,134)
Interest expense	(2,408)	(2,484)	(8,585)	(4,443)
Interest income	594	1,038	3,163	3,434
Other income (loss), net	609	(3,962)		(22,913)
Loss from continuing operations before income tax benefit	(63,464)	(1,164,406)	(187,629)	(1,240,056)
Income tax benefit	(17,653)	(37,257)	(89,814)	(65,961)
Loss from continuing operations	(45,811)	(1,127,149)	(97,815)	(1,174,095)
Income from discontinued operations				5,180
Net loss	(45,811)	(1,127,149)	(97,815)	(1,168,915)
Eliminations
Cost and expenses:
Interest expense	10,918	8,748	29,521	27,501
Interest income	(10,918)	(8,748)	(29,521)	(27,501)
Equity in earnings (losses) of subsidiaries	37,627	1,026,741	45,447	903,060
Net loss	$ 37,627	$ 1,026,741	$ 45,447	$ 903,060