Quarterly report pursuant to Section 13 or 15(d)

Organization and Accounting Policies (Reconciliation of Cash, Cash Equivalents, and Restricted Cash) (Details)

v3.20.2
Organization and Accounting Policies (Reconciliation of Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Organization and Accounting Policies [Abstract]        
Cash and cash equivalents $ 41,986 $ 45,917 $ 57,227  
Restricted cash - current 82 911 769  
Restricted cash - non-current 925 925 924  
Abandonment funding 11,885 11,371 11,112  
Total cash, cash equivalents and restricted cash $ 54,878 $ 59,124 $ 70,032 $ 46,655