Commitments and Contingencies (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 18, 2017 well	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items]
Litigation settlement expense		$ 4,775	$ 0	$ 4,775	$ 0
Trinity Royal Partners, LP
Loss Contingencies [Line Items]
Number of properties under litigation case | well	2
Litigation settlement expense		$ 4,800		$ 3,100