Quarterly report pursuant to Section 13 or 15(d)

- Credit Loss (Details)

v3.20.1
- Credit Loss (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Customer
party
producer
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]      
Retained earnings $ 483,005   $ 319,987
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 52    
Provision for expected credit losses 96    
Write-offs and recoveries 0    
Balance at end of period $ 224    
Customers      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Commodity products, number of customers | Customer 20    
Financing Receivable, Credit Risk Percentage 0.00%    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 0    
Provision for expected credit losses 0    
Write-offs and recoveries 0    
Balance at end of period $ 0    
Mutual Operators      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Number of upstream producers | producer 2    
Financing Receivable, Credit Risk Percentage 1.00% 0.00%  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 0    
Provision for expected credit losses 24    
Write-offs and recoveries 0    
Balance at end of period $ 24    
Large Partners      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Number of legal entities with working interest in properties | party 4    
Financing Receivable, Credit Risk Percentage 2.00% 1.00%  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 0    
Provision for expected credit losses 53    
Write-offs and recoveries 0    
Balance at end of period $ 113    
All Others      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Number of legal entities with working interest in properties | party 30    
Financing Receivable, Credit Risk Percentage 10.00% 5.00%  
Financing Receivable, Past Due $ 100    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 52    
Provision for expected credit losses 19    
Write-offs and recoveries 0    
Balance at end of period 87    
Adjustment upon adoption      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 76    
Adjustment upon adoption | Customers      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 0    
Adjustment upon adoption | Mutual Operators      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 0    
Adjustment upon adoption | Large Partners      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 60    
Adjustment upon adoption | All Others      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 16    
Accounting Standards Update 2016-13 | Adjustment upon adoption      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Retained earnings   $ (100)