Reporting Segments (Assets by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 383,783	$ 414,440
Capital expenditures	116	905
Production
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	24,243	45,550
Capital expenditures	(5)	130
Midstream
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	356,635	362,961
Capital expenditures	121	775
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 2,905	$ 5,929