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Properties and Equipment Assets Held for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Long Lived Assets Held-for-sale [Line Items]      
Document Period End Date Mar. 31, 2019    
Impairment of properties and equipment $ 7,875 $ 33,188  
(Gain) loss on sale of properties and equipment (369) 1,432  
Assets 4,563,928   $ 4,544,145
Asset retirement obligations 82,497   85,312
Liabilities 2,154,173   2,017,437
Proceeds from sale of properties and equipment 102 $ 20  
Property, Plant and Equipment, Gross 6,643,492   6,373,157
Midstream [Member] [Member]      
Long Lived Assets Held-for-sale [Line Items]      
Assets 152,847    
Asset retirement obligations 4,614    
Liabilities 4,614    
Property, Plant and Equipment, Gross 150,360    
Assets Held-for-sale, Not Part of Disposal Group, Other $ 2,487   3,257
Utica Shale [Member]      
Long Lived Assets Held-for-sale [Line Items]      
Assets     140,705
Asset retirement obligations     4,111
Liabilities     4,111
Property, Plant and Equipment, Gross     $ 137,448