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
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Organization and Accounting Policies [Abstract]        
Cash and cash equivalents $ 44,841 $ 45,917 $ 48,557  
Restricted cash - current 1,090 911 799  
Restricted cash - non-current 925 925 922  
Abandonment funding 11,420 11,371 11,550  
Total cash, cash equivalents and restricted cash $ 58,276 $ 59,124 $ 61,828 $ 46,655