Annual report pursuant to Section 13 and 15(d)

Acquisitions And Dispositions (Preliminary Estimates Of Fair Value Of Identifiable Assets Acquired And Liabilities Assumed) (Details)

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Acquisitions And Dispositions (Preliminary Estimates Of Fair Value Of Identifiable Assets Acquired And Liabilities Assumed) (Details) - Sojitz [Member]
$ in Thousands
Nov. 22, 2016
USD ($)
Business Acquisition [Line Items]  
Wells, platforms and other production facilities $ 5,754
Equipment and other 684
Value added tax and other receivables 297
Abandonment funding 546
Accounts receivable - trade 888
Prepayments and other 220
Asset retirement obligations (1,731)
Accounts liabilities and other (747)
Total identifiable net assets and consideration transferred $ 5,911