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Leases (Narrative) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 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%    
Operating right of use asset $ 7,315   $ 0
Total operating lease liability $ 7,091    
Number of compressors under finance lease agreement 20    
Finance lease term 7 years    
Finance Lease Obligations, Current $ 4,100    
Finance Lease Obligations, Noncurrent $ 4,300    
Discount rate finance leases 4.00%    
Maintenance $ 2,750    
Interest 333    
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]      
Operating right of use asset   $ 3,700  
Total operating lease liability   $ 3,500