Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Organization and Accounting Policies (Reconciliation of Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Organization and Accounting Policies [Abstract]        
Cash and cash equivalents $ 57,227 $ 33,360    
Restricted cash - current 769 804    
Restricted cash - non-current 924 920    
Abandonment funding 11,112 11,571    
Total cash, cash equivalents and restricted cash shown in the condensed consolidated balance sheet $ 70,032 $ 46,655 $ 46,466 $ 32,286