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Acquisitions and Divestitures (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Feb. 15, 2017
Oil and gas properties:      
Commodity derivative liability - short-term $ 4,570  
Commodity derivative liability - long-term 3,447  
Asset retirement obligations - short-term $ 769 $ 380  
Total net assets acquired     $ 32,036
Carbon California [Member]      
Acquisitions And Divestitures [Line Items]      
Cash     275
Accounts receivable:      
Joint interest billings and other     690
Receivable - related party     1,610
Prepaid expense, deposits, and other current assets     1,723
Oil and gas properties:      
Proved     56,477
Unproved     1,495
Other property and equipment, net     877
Other long-term assets     475
Accounts payable and accrued liabilities     (6,054)
Commodity derivative liability - short-term     (916)
Commodity derivative liability - long-term     (1,729)
Asset retirement obligations - short-term     (384)
Asset retirement obligations - long-term     (2,537)
Subordinated Notes, related party, net     (8,874)
Senior Revolving Notes, related party     (11,000)
Notes payable     (92)
Total net assets acquired     $ 32,036