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Property, Plant and Equipment - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Property, Plant and Equipment        
Full cost ceiling limitation impairment $ 298,000   $ 657,400  
Impairment charges 354,451 $ 1,074,588 718,194 $ 3,647,845
Loss on sale of assets 416 $ 6,771 (2,794) $ 2,097
Drilling and oil field services assets        
Property, Plant and Equipment        
Assets held for sale 800   800  
Drilling And Oil Field Services        
Property, Plant and Equipment        
Loss on sale of assets 100   1,700  
Midstream Services | Electrical Transmissions        
Property, Plant and Equipment        
Impairment charges $ 55,600   55,600  
Midstream Services | Compressors and various equipment        
Property, Plant and Equipment        
Impairment charges     $ 1,700