Consolidated Statements of Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Natural Gas, NGLs and Oil Sales	$ 229,743	$ 171,236	$ 496,041	$ 339,078
Coal Sales	536,298	505,060	1,070,979	1,052,969
Other Revenue, Net	70,087	65,218	139,374	133,902
Gas Royalty Interests and Purchased Gas Sales	19,739	18,434	49,958	33,996
Freight-Outside	10,109	9,660	20,054	21,913
Other Income (including equity earnings)	69,977	28,520	125,031	56,907
Gain (Loss) on Disposition of Assets	1,417	30,039	5,086	32,345
Total Revenue and Other Income	937,370	828,167	1,906,523	1,671,110
Oil and Gas Property, Lease Operating Expense	26,374	25,221	55,617	47,235
Gas Gathering, Transportation, Marketing and Processing Costs	57,796	48,871	111,578	97,303
Production Tax Expense	10,145	7,409	20,331	11,978
E&P Direct Administration and Selling	13,503	11,803	25,156	22,889
E&P Depreciation, Depletion, and Amortization	71,499	52,846	143,228	105,834
Exploration and Production Costs	4,624	10,406	7,723	20,895
Production Royalty Interests and Purchased Gas Costs	16,672	14,595	42,768	27,360
Other Expenses	21,012	22,557	47,176	47,950
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities	15,517	10,472	32,881	19,062
Oil and Gas Production Expense	237,142	204,180	486,458	400,506
Operating Expenses	347,541	329,934	674,390	664,949
Taxes, Miscellaneous	27,603	26,438	54,091	54,877
Direct Administration, Selling and Other Costs	11,816	12,252	23,110	23,136
Coal Depreciation, Depletion, Amortization	65,086	55,247	121,149	112,437
Freight Expense	10,109	9,660	20,054	21,913
General and Administrative Expense	10,450	10,038	22,963	19,339
Other Cost and Expense, Operating	12,035	11,996	31,330	31,911
Cost of Coal Products and Services	484,640	455,565	947,087	928,562
Other Nonoperating Expense	99,079	73,872	173,628	196,908
Other General and Administrative Expense	428	470	834	893
Depreciation, Depletion and Amortization, Nonproduction	1,314	1,436	2,638	2,836
Gains (Losses) on Extinguishment of Debt	74,277	0	74,277	0
Interest Expense	64,211	54,517	115,142	107,894
Other General Expense	239,309	130,295	366,519	308,531
Total Costs	961,091	790,040	1,800,064	1,637,599
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(23,721)	38,127	106,459	33,511
Income Tax Expense (Benefit)	1,214	29,565	9,703	28,673
Income (Loss) from Continuing Operations Attributable to Parent	(24,935)	8,562	96,756	4,838
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	(21,375)	(5,687)	(19,472)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(24,935)	(12,813)	91,069	(14,634)
Net Income (Loss) Attributable to Noncontrolling Interest	0	(287)	0	(544)
Net Income (Loss)	$ (24,935)	$ (12,526)	$ 91,069	$ (14,090)