Commitments and Contingencies Environmental Compliance (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2019 bbl Release	Mar. 31, 2020 USD ($) miles	Dec. 31, 2014 bbl Release	Dec. 31, 2019 USD ($)	Sep. 15, 2015 USD ($)	May 31, 2015 bbl
Site Contingency [Line Items]
Miles of Water Gathering Pipeline Removed | miles		30
Fort Berthold Indian Reservation
Site Contingency [Line Items]
Site Contingency, Loss Exposure, Number of Releases of Produced Water | Release	2		3
Site Contingency, Loss Exposure, Release of Produced Water | bbl	5,000		28,000			5,200
Accrual for Environmental Loss Contingencies		$ 4.3		$ 6.7
Maximum
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss					$ 1.1
Maximum | Fort Berthold Indian Reservation
Site Contingency [Line Items]
Site Contingency, Loss Exposure in Excess of Accrual, Best Estimate		$ 8.5