Consolidated Statements of Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Natural Gas, NGLs and Oil Sales	$ 257,358	$ 192,781	$ 753,399	$ 531,859
Coal Sales	483,960	479,311	1,554,939	1,532,280
Other Revenue, Net	73,673	63,876	213,047	197,778
Gas Royalty Interests and Purchased Gas Sales	18,815	17,113	68,773	51,109
Freight-Outside	2,497	9,579	22,551	31,492
Other Income (including equity earnings)	40,784	20,822	165,815	77,729
Gain (Loss) on Disposition of Assets	7,529	19,863	12,615	52,208
Total Revenue and Other Income	884,616	803,345	2,791,139	2,474,455
Oil and Gas Property, Lease Operating Expense	30,005	23,600	85,622	70,835
Gas Gathering, Transportation, Marketing and Processing Costs	68,234	46,699	179,813	144,002
Production Tax Expense	8,486	8,033	28,817	20,011
E&P Direct Administration and Selling	14,060	11,725	39,216	34,615
E&P Depreciation, Depletion, and Amortization	82,538	58,998	225,766	164,832
Exploration and Production Costs	8,042	22,771	15,765	43,666
Production Royalty Interests and Purchased Gas Costs	15,751	13,805	58,519	41,165
Other Expenses	13,700	26,289	60,876	74,239
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities	14,874	10,177	47,755	29,239
Oil and Gas Production Expense	255,690	222,097	742,149	622,604
Operating Expenses	339,216	328,393	1,013,606	993,342
Taxes, Miscellaneous	23,306	24,380	77,397	79,257
Direct Administration, Selling and Other Costs	10,479	11,608	33,589	34,744
Coal Depreciation, Depletion, Amortization	64,880	57,265	186,029	169,702
Freight Expense	2,497	9,579	22,551	31,492
General and Administrative Expense	10,434	8,607	33,397	27,946
Other Cost and Expense, Operating	10,114	11,145	41,444	43,056
Cost of Coal Products and Services	460,926	450,977	1,408,013	1,379,539
Other Nonoperating Expense	92,974	75,439	266,601	272,346
Other General and Administrative Expense	425	376	1,259	1,269
Depreciation, Depletion and Amortization, Nonproduction	1,247	1,467	3,885	4,303
Gains (Losses) on Extinguishment of Debt	20,990	0	95,267	0
Interest Expense	55,397	56,300	170,539	164,194
Other General Expense	171,033	133,582	537,551	442,112
Total Costs	887,649	806,656	2,687,713	2,444,255
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(3,033)	(3,311)	103,426	30,200
Income Tax Expense (Benefit)	(1,388)	68,858	8,315	97,531
Income (Loss) from Continuing Operations Attributable to Parent	(1,645)	(72,169)	95,111	(67,331)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	8,120	(5,687)	(11,352)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(1,645)	(64,049)	89,424	(78,683)
Net Income (Loss) Attributable to Noncontrolling Interest	0	(398)	0	(942)
Net Income (Loss)	$ (1,645)	$ (63,651)	$ 89,424	$ (77,741)