XML 62 R47.htm IDEA: XBRL DOCUMENT v3.10.0.1
Properties and Equipment, Net - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Properties and Equipment            
Impairment of oil and gas properties       $ 0 $ 482,811 $ 435,619
Properties and equipment, net (Successful efforts method) $ 3,072,204     3,463,606 3,072,204  
South Texas, East Texas and Louisiana            
Properties and Equipment            
Impairment of oil and gas properties     $ 435,600      
Sale of oil and gas properties before closing adjustments     $ 89,200     $ 89,200
Assets Held-for-sale            
Properties and Equipment            
Transaction amount 762,195       762,195  
Assets Held-for-sale | West Virginia, Virginia, and Ohio            
Properties and Equipment            
Impairment of oil and gas properties   $ 68,600        
Properties and equipment, net (Successful efforts method)   $ 37,900        
Assets Held-for-sale | Haynesville Shale            
Properties and Equipment            
Transaction amount 30,000       30,000  
Assets Held-for-sale | Eagle Ford            
Properties and Equipment            
Transaction amount 765,000       $ 765,000  
Assets Held-for-sale | Eagle Ford | South Texas            
Properties and Equipment            
Impairment of oil and gas properties $ 414,300          
Properties and equipment, net (Successful efforts method)       $ 765,600