Leases (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)
Adoption of ASC842 [Line Items]
Right of use asset	$ 5,592	$ 5,673
Total operating lease liability	$ 5,520
Number of compressors under capital lease agreement	20
Finance lease term	7 years
Current portion of finance leases	$ 3,216	$ 4,164
Discount rate finance leases	4.00%
Maintenance	$ 525
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