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Debt (Narrative) (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
Aug. 31, 2019
USD ($)
Apr. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
2024 Notes        
Debt Instrument [Line Items]        
2024 Notes $ 500,000,000     $ 500,000,000
Kingfisher Credit Facility        
Debt Instrument [Line Items]        
Maximum leverage ratio, scenario one 4.5      
Maximum leverage ratio, scenario two 4.75      
Consolidated EBITDA threshold $ 75,000,000.0      
Minimum interest coverage ratio 2.5      
Remaining borrowing capacity $ 117,000,000      
Amendment To KFM Credit Facility        
Debt Instrument [Line Items]        
Credit facility amount 15,000,000.0      
Alta Mesa Credit Facility        
Debt Instrument [Line Items]        
Borrowing base 400,000,000      
Monthly payments $ 32,500,000      
Debt covenant, current ratio, minimum required 1.0      
Maximum leverage ratio 4      
KFM Credit Facility | Kingfisher Credit Facility        
Debt Instrument [Line Items]        
Credit facility amount $ 300,000,000      
Alta Mesa RBL | 2024 Notes        
Debt Instrument [Line Items]        
Notes payable, fair value $ 194,900,000      
Subsequent Event | Alta Mesa Credit Facility        
Debt Instrument [Line Items]        
Borrowing base     $ 370,000,000  
Current borrowing base   $ 162,400,000    
Credit facility amount   200,000,000 $ 370,000,000  
Subsequent Event | KFM Credit Facility        
Debt Instrument [Line Items]        
Cash   13,800,000    
Remaining borrowing capacity   74,000,000    
Subsequent Event | SRII Opco        
Debt Instrument [Line Items]        
Cash   $ 5,700,000