Leases (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Adoption of ASC842 [Line Items]
Operating leases under ASC 840 future minimum payments due in next year			$ 4,600
Operating leases under ASC 840 future minimum payments due in two years			1,700
Operating leases under ASC 840 future minimum payments due in three years			400
Average working interest in operated properties	95.00%
Right of use asset	$ 5,673		$ 0
Total operating lease liability	$ 5,501
Number of compressors under capital lease agreement	20
Finance lease term	7 years
Current portion of finance leases	$ 4,164
Total long-term finance lease payments	$ 3,215
Discount rate finance leases	4.00%
Maintenance	$ 2,336
Interest	253
Finance leases, future minimum payments, average annual payment	$ 4,400
Finance lease fair market value percentage for purchase	10.00%
Accounting Standards Update 2016-02 [Member]
Adoption of ASC842 [Line Items]
Right of use asset		$ 3,700
Total operating lease liability		$ 3,500