Quarterly report pursuant to Section 13 or 15(d)

Contingencies - Additional Information (Details)

v3.10.0.1
Contingencies - Additional Information (Details)
$ in Thousands
 9 Months Ended
Jan. 27, 2017
USD ($)
Sep. 30, 2018
USD ($)
claim
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
May 31, 2017
USD ($)
Dec. 15, 2014
DeepwaterWell
Dec. 31, 2010
USD ($)
Loss Contingencies [Line Items]              
Number of deepwater wells abandoned | DeepwaterWell           3  
Deposit Into registry of court   $ 49,500 $ 49,500        
Loss contingency accrued amount   49,500 49,500        
Additional royalty payment   600   $ 1,200     $ 4,700
Payments for royalty $ 4,700            
Bond requied to post in order to appeal 7,200            
Cash collacteral required to appeal $ 6,900            
Liability reserve   $ 2,100          
Royalty payment processing revised period   84 months          
BSEE              
Loss Contingencies [Line Items]              
Number of notices | claim   8          
Proposed civil penalties related to various incidents of noncompliance, total   $ 7,900          
Payments for civil penalty   3,400          
Apache Corporation | Judicial Ruling              
Loss Contingencies [Line Items]              
Amount owed to Apache under judicial decision         $ 43,200    
Prejudgment interest, attorney fees and judgment costs         $ 6,300    
Apache Corporation | Judicial Ruling | Other Noncurrent Assets              
Loss Contingencies [Line Items]              
Deposit Into registry of court   49,500 49,500        
Apache Corporation | Judicial Ruling | Other Noncurrent Liabilities              
Loss Contingencies [Line Items]              
Loss contingency accrued amount   $ 49,500 $ 49,500