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Industry Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Total Revenue and Other Income $ 698,709 $ 532,828  
Natural Gas, NGLs and Oil Sales 317,763 181,255  
Revenue, Net 646,062 491,973  
Sales-Outside 634,211 407,419  
Gain (Loss) on Hedging Activity (22,463) 55,060  
Sales Revenue, Services, Other 13,053 7,766  
Revenue from Purchased Oil and Gas 8,979 8,618  
Freight-Outside 12,282 13,110  
Segment Reporting - Intersegment Transfers 0 0  
Income (Loss) from Continuing Operations before Income Taxes, Domestic (87,291) (67,091)  
Total Assets 9,063,769 10,715,874 $ 9,183,981
Depreciation, Depletion and Amortization 148,753 154,988  
Segment Reporting - Capital Expenditures 112,978 77,656  
Income (Loss) from Equity Method Investments 12,330 16,665  
Total Reportable Segments [Member]      
Segment Reporting Information [Line Items]      
Income (Loss) from Continuing Operations before Income Taxes, Domestic (32,487) 195  
Gas Segment [Member]      
Segment Reporting Information [Line Items]      
Natural Gas, NGLs and Oil Sales 317,763 181,255  
Revenue, Net 304,279 245,357  
Gain (Loss) on Hedging Activity (22,463) 55,060  
Sales Revenue, Services, Other 0 0  
Revenue from Purchased Oil and Gas 8,979 8,618  
Freight-Outside 0 0  
Segment Reporting - Intersegment Transfers 0 424  
Income (Loss) from Continuing Operations before Income Taxes, Domestic (93,502) (22,879)  
Total Assets 6,074,299 6,814,568  
Depreciation, Depletion and Amortization 95,348 105,715  
Segment Reporting - Capital Expenditures 100,793 62,862  
Income (Loss) from Equity Method Investments 12,140 15,598  
Equity Method Investments 194,607 248,034  
Gas Segment [Member] | Marcellus Shale [Member]      
Segment Reporting Information [Line Items]      
Natural Gas, NGLs and Oil Sales 189,175 96,138  
Revenue, Net 156,510 144,702  
Gain (Loss) on Hedging Activity (32,665) 48,564  
Sales Revenue, Services, Other 0 0  
Revenue from Purchased Oil and Gas 0 0  
Freight-Outside 0 0  
Segment Reporting - Intersegment Transfers 0 0  
Income (Loss) from Continuing Operations before Income Taxes, Domestic 29,969 19,482  
Gas Segment [Member] | Utica Shale [Member]      
Segment Reporting Information [Line Items]      
Natural Gas, NGLs and Oil Sales 53,668 34,261  
Revenue, Net 50,980 44,270  
Gain (Loss) on Hedging Activity (2,688) 10,009  
Sales Revenue, Services, Other 0 0  
Revenue from Purchased Oil and Gas 0 0  
Freight-Outside 0 0  
Segment Reporting - Intersegment Transfers 0 0  
Income (Loss) from Continuing Operations before Income Taxes, Domestic 17,807 3,256  
Gas Segment [Member] | Coalbed Methane [Member]      
Segment Reporting Information [Line Items]      
Natural Gas, NGLs and Oil Sales 58,626 41,920  
Revenue, Net 49,428 61,465  
Gain (Loss) on Hedging Activity (9,198) 19,121  
Sales Revenue, Services, Other 0 0  
Revenue from Purchased Oil and Gas 0 0  
Freight-Outside 0 0  
Segment Reporting - Intersegment Transfers 0 424  
Income (Loss) from Continuing Operations before Income Taxes, Domestic 3,608 12,606  
Gas Segment [Member] | Other Gas [Member]      
Segment Reporting Information [Line Items]      
Natural Gas, NGLs and Oil Sales 16,294 8,936  
Revenue, Net 47,361 (5,080)  
Gain (Loss) on Hedging Activity 22,088 (22,634)  
Sales Revenue, Services, Other 0 0  
Revenue from Purchased Oil and Gas 8,979 8,618  
Freight-Outside 0 0  
Segment Reporting - Intersegment Transfers 0 0  
Income (Loss) from Continuing Operations before Income Taxes, Domestic (144,886) (58,223)  
Coal Segment [Member] | PA Operations [Member]      
Segment Reporting Information [Line Items]      
Segment Reporting - Intersegment Transfers 0    
PA Operations [Member]      
Segment Reporting Information [Line Items]      
Revenue, Net 328,730 239,274  
Sales-Outside 316,448 226,164  
Gain (Loss) on Hedging Activity 0 0  
Sales Revenue, Services, Other 0 0  
Revenue from Purchased Oil and Gas 0 0  
Freight-Outside 12,282 13,110  
Segment Reporting - Intersegment Transfers   0  
Income (Loss) from Continuing Operations before Income Taxes, Domestic 61,015 23,074  
Total Assets 1,955,172 2,078,559  
Depreciation, Depletion and Amortization 42,301 41,266  
Segment Reporting - Capital Expenditures 8,118 12,904  
Other Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue, Net 17,627 7,766  
Sales-Outside 0 0  
Gain (Loss) on Hedging Activity 0 0  
Sales Revenue, Services, Other 13,053 7,766  
Revenue from Purchased Oil and Gas 0 0  
Freight-Outside 0 0  
Segment Reporting - Intersegment Transfers 4,574 0  
Income (Loss) from Continuing Operations before Income Taxes, Domestic (50,230) (66,862)  
Total Assets 1,029,724 1,295,011  
Depreciation, Depletion and Amortization 11,104 8,007  
Segment Reporting - Capital Expenditures 4,067 1,890  
Income (Loss) from Equity Method Investments 190 1,067  
Equity Method Investments 2,778 3,594  
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue, Net (4,574) (424)  
Sales-Outside 0 0  
Gain (Loss) on Hedging Activity 0 0  
Sales Revenue, Services, Other 0 0  
Revenue from Purchased Oil and Gas 0 0  
Freight-Outside 0 0  
Segment Reporting - Intersegment Transfers (4,574) (424)  
Income (Loss) from Continuing Operations before Income Taxes, Domestic (4,574) (424)  
Total Assets 4,574 527,736  
Depreciation, Depletion and Amortization 0 0  
Segment Reporting - Capital Expenditures $ 0 $ 0