- 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)