Annual report pursuant to Section 13 and 15(d)

Contingencies - Additional Information (Details)

v3.6.0.2
Contingencies - Additional Information (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 28, 2016
USD ($)
Jan. 31, 2014
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
claim
Dec. 31, 2015
USD ($)
Dec. 31, 2010
USD ($)
Loss Contingencies [Line Items]            
Obligation to secure financial assurances     $ 260,800,000      
Underpayment of royalties   $ 30,000        
Under payment percentage of total royalty payments   0.0045%        
Statutory fine payment relative to underpayment   $ 2,300,000   $ 1,100,000    
Amount accrued       $ 0 $ 0  
Notified disallowed amount in reductions taken by ONRR           $ 4,700,000
Royalty payment processing revised period       84 months    
Payments for royalty       $ 500,000    
Proposed penalties       $ 1,500,000    
BSEE            
Loss Contingencies [Line Items]            
Number of notices | claim       4    
Proposed civil penalties related to various incidents of noncompliance, total       $ 8,100,000    
Payments for civil penalty       $ 100,000 $ 200,000  
Apache Corporation | Judicial Ruling            
Loss Contingencies [Line Items]            
Amount awarded for non-compliance fines and lawsuits $ 43,200,000          
Amount offset against litigation compensation amount $ 17,000,000