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Organization and Accounting Policies (Reconciliation of Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Organization and Accounting Policies [Abstract]        
Cash and cash equivalents $ 18,939 $ 48,675 $ 19,251  
Restricted cash - current 4,230 79 82  
Restricted cash - non-current 1,752 1,752 1,752  
Abandonment funding 21,369 21,808 22,862  
Total cash, cash equivalents and restricted cash $ 46,290 $ 72,314 $ 43,947 $ 61,317