Reporting Segments (Assets by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 414,440	$ 486,685
Capital expenditures	905	4,867
Production
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	45,550	53,556
Capital expenditures	130	11
Midstream
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	362,961	429,523
Capital expenditures	775	4,856
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 5,929	$ 3,606