Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Property and equipment (Details)

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Summary of Significant Accounting Policies - Property and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property and Equipment      
Depreciation expense $ 914,867 $ 972,465 $ 824,610
Oil and Gas Properties      
Exploratory drilling costs initially capitalized, but subsequently charged to expense   0 0
Impairment of oil and gas properties 1,300,444 549,437 159,598
Impairment of oil and gas properties for leases expired or expected to expire 393,000 549,000 160,000
Impairment of proved properties 14,782 9,658 23,431
Depreciation, depletion, and amortization expense for oil and gas properties 884,000 832,000 694,000
Impairment of long-lived assets other than oil and gas properties 15,000 10,000 23,000
Deferred Financing Costs      
Unamortized deferred financing costs included in other assets 7,000    
Unamortized deferred financing costs included in long-term debt 19,000    
Amounts amortized and the write-off of previously deferred debt issuance costs 11,000 13,000 13,000
Utica Shale      
Oil and Gas Properties      
Impairment of proved properties $ 881,000    
Gathering Systems and Facilities      
Property and Equipment      
Estimated useful life 50 years    
Other property and equipment      
Property and Equipment      
Depreciation expense $ 8,000 9,000 10,000
Other property and equipment | Minimum      
Property and Equipment      
Estimated useful life 2    
Other property and equipment | Maximum      
Property and Equipment      
Estimated useful life 20 years    
Gathering pipelines, compressor stations, and fresh water distribution systems      
Property and Equipment      
Depreciation expense $ 22,000 $ 131,000 $ 120,000
Water handling and treatment | Minimum      
Property and Equipment      
Estimated useful life 5    
Water handling and treatment | Maximum      
Property and Equipment      
Estimated useful life 20 years    
Oil and gas property wells      
Oil and Gas Properties      
Impairment of oil and gas properties $ 26,000