Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Organization and Accounting Policies (Reconciliation of Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Organization and Accounting Policies [Abstract]        
Cash and cash equivalents $ 60,973 $ 45,917 $ 46,195  
Restricted cash - current 994 911 788  
Restricted cash - non-current 925 925 921  
Abandonment funding 11,227 11,371 11,390  
Total cash, cash equivalents and restricted cash $ 74,119 $ 59,124 $ 59,294 $ 46,655