Commitments and Contingencies Additional information (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) MMcf bbl	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Supplemental environmental legal expense paid | $					$ 1.5
Document Period End Date			Jun. 30, 2020
First facilities agreement with midstream provider [Member]
Loss Contingencies [Line Items]
incremental volume commitment | MMcf			97.9
Delaware Basin/Wattenberg Field [Member]
Loss Contingencies [Line Items]
Transportation netted against Revenue | $	$ 6.6	$ 12.2	$ 13.0	$ 23.1
Minimum [Member] | Delaware Basin
Loss Contingencies [Line Items]
Committed Barrels of Crude Oil per day | bbl			24,000
Maximum [Member] | Delaware Basin
Loss Contingencies [Line Items]
Committed Barrels of Crude Oil per day | bbl			22,000