Revenue Recognition - Revenue by product type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from External Customer [Line Items]
Revenues	$ 46,027	$ 17,220	$ 85,838	$ 54,250
Oil sales
Revenue from External Customer [Line Items]
Revenues	36,369	11,976	64,234	41,986
Natural gas liquid sales
Revenue from External Customer [Line Items]
Revenues	4,940	1,762	9,239	4,362
Natural gas sales
Revenue from External Customer [Line Items]
Revenues	$ 4,718	$ 3,482	$ 12,365	$ 7,902