Commitments and Contingencies Additional information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) bbl MMcf	Sep. 30, 2018 USD ($)
Loss Contingencies [Line Items]
Document Period End Date			Sep. 30, 2019
First facilities agreement with midstream provider [Member]
Loss Contingencies [Line Items]
incremental volume commitment | MMcf			51.5
Delaware Basin/Wattenberg Field [Member]
Loss Contingencies [Line Items]
Transportation netted against Revenue | $	$ 13.7	$ 11.0	$ 36.8	$ 16.2
Minimum [Member] | Delaware Basin
Loss Contingencies [Line Items]
Committed Barrels of Crude Oil per day			22,200
Maximum [Member] | Delaware Basin
Loss Contingencies [Line Items]
Committed Barrels of Crude Oil per day			26,400