Annual report pursuant to Section 13 and 15(d)

New Accounting Standards (Reconciliation Of Cash, Cash Equivalents, And Restricted Cash) (Details)

v3.10.0.1
New Accounting Standards (Reconciliation Of Cash, Cash Equivalents, And Restricted Cash) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
New Accounting Standards [Abstract]          
Cash and cash equivalents $ 33,360 $ 33,715 $ 19,669    
Restricted cash - current 804 1,025 842    
Restricted cash - non-current 920 918 967    
Abandonment funding 11,571 $ 10,808 10,808    
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 46,655   $ 32,286 $ 30,643 $ 47,372