Revenue Recognition - Revenue by product type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from External Customer [Line Items]
Revenues	$ 32,109	$ 53,145	$ 86,360	$ 146,101
Oil
Revenue from External Customer [Line Items]
Revenues	24,524	42,187	66,510	120,496
NGLs
Revenue from External Customer [Line Items]
Revenues	3,202	3,439	7,565	10,381
Natural gas
Revenue from External Customer [Line Items]
Revenues	$ 4,383	$ 7,519	$ 12,285	$ 15,224