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Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Natural Gas, NGLs and Oil Sales $ 317,763 $ 181,255
Unrealized Gain (Loss) on Commodity Derivatives (22,463) 55,060
Coal Sales 316,448 226,164
Other Revenue, Net 13,053 7,766
Purchased Gas Sales 8,979 8,618
Freight-Outside 12,282 13,110
Other Income (including equity earnings) 40,696 48,131
Gain (Loss) on Sale of Assets 11,951 (7,276)
Total Revenue and Other Income 698,709 532,828
Oil and Gas Property, Lease Operating Expense 21,633 27,739
Gas Gathering, Transportation, Marketing and Processing Costs 94,332 93,974
Production Tax Expense 9,329 8,303
E&P Depreciation, Depletion, and Amortization 95,348 105,715
Exploration and Production Costs 9,786 1,747
Production Royalty Interests and Purchased Gas Costs 8,895 7,868
Other Expenses 17,930 22,798
Impairment of Oil and Gas Properties 137,865 0
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities 21,490 22,458
Oil and Gas Production Expense 416,608 290,602
Operating Expenses 199,815 154,101
Coal Depreciation, Depletion, Amortization 42,301 41,266
Freight Expense 12,282 13,110
General and Administrative Expense 14,868 5,776
Cost of Coal Products and Services 269,266 214,253
Other Nonoperating Expense 43,200 35,339
Other General and Administrative Expense 2,211 1,853
Depreciation, Depletion and Amortization, Nonproduction 11,104 8,007
Gains (Losses) on Extinguishment of Debt (822) 0
Interest Expense 44,433 49,865
Other General Expense 100,126 95,064
Total Costs 786,000 599,919
Income (Loss) from Continuing Operations before Income Taxes, Domestic (87,291) (67,091)
Income Tax Expense (Benefit) (53,789) (23,800)
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest (33,502) (43,291)
Income (Loss) from Continuing Operations Attributable to Parent (38,966) (44,405)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 0 (53,167)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest (33,502) (96,458)
Net Income (Loss) Attributable to Noncontrolling Interest 5,464 1,114
Net Income (Loss) $ (38,966) $ (97,572)