Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Contingencies (Details Textual)

v3.19.3
Note 12 - Contingencies (Details Textual)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
yr
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jul. 25, 2017
USD ($)
Jun. 30, 2017
USD ($)
May 31, 2017
USD ($)
Jan. 27, 2017
USD ($)
Dec. 31, 2010
USD ($)
Escrow Deposit   $ 49,500          
Loss Contingency Accrual, Ending Balance   49,500          
Additional Royalty Due to Disallowed Deductions               $ 4,700 $ 4,700
Bonds Posted to Appeal IBLA Decision         $ 7,200        
Collateral for Bonds Posted Related to Appeal with IBLA         $ 6,900        
Royalties in Kind, Liability Reserve   2,200   2,100          
Royalties in Kind, Liability Reserve, Interest Asserted as Waived 700 700              
Incremental Payments for Royalties Related to Unbundling   400 $ 600            
BSEE [Member]                  
Loss Contingency Accrual, Ending Balance 3,500 3,500   3,500          
Payment for Civil Penalty   $ 0 $ 0            
Loss Contingency, Number of Claims Filed | yr   9              
Proposed Civil Penalties   $ 7,700              
Apache Corporation [Member] | Judicial Ruling [Member]                  
Loss Contingency, Damages Payable to Other Party Except Prejudgment Interest, Attorney Fees, and Judgment Costs             $ 43,200    
Prejudgment Interest, Attorney Fees, and Judgment Costs Payable             $ 6,300    
Escrow Deposit           $ 49,500      
Apache Corporation [Member] | Judicial Ruling [Member] | Other Noncurrent Assets [Member]                  
Loss Contingency Accrual, Ending Balance       49,500          
Apache Corporation [Member] | Judicial Ruling [Member] | Other Noncurrent Liabilities [Member]                  
Loss Contingency Accrual, Ending Balance       $ 49,500          
Apache Corporation [Member] | Judicial Ruling [Member] | Interest Expense [Member]                  
Litigation Settlement Interest $ (1,900) $ (1,900)