Amount of settlement payments remaining to be received in year four following settlement.

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Amount of settlement payments remaining to be received in each of years three following settlement.

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No definition available.

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
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-Paragraph 1
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The net amount of nonoperating interest income (expense).

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Cash received for the settlement of litigation during the current period.

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
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Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount.

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-SubTopic 30
-Section 45
-Paragraph 1A
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Yield on the receivable, on which interest has been imputed, as calculated from its issuance value or purchase price. The calculated effective interest rate considers factors such as the issued face value or price paid for the receivable, the time period between payments, and the time until maturity [full receipt] of the receivable.

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The receivable or note face amount less the unamortized discount or premium.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Claim Settlement Receivable (Details) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 24, 2016	Oct. 31, 2017	Oct. 31, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2017
Receivables
Litigation settlement receivable				$ 5,360		$ 5,360			$ 5,280
BP Exploration & Production Inc.
Receivables
Claim settlement	$ 13,200
Litigation settlement amount received		$ 2,700	$ 5,000
Litigation settlement payments to be received in year three following settlement	2,700
Litigation settlement payments to be received in year four following settlement	$ 2,700
Imputed interest rate on litigation settlement receivable	3.00%
Litigation settlement receivable	$ 12,500
Unamortized discount	$ 700
Interest income				$ 100	$ 100	$ 100	$ 100
Other income \| BP Exploration & Production Inc.
Receivables
Claim settlement								$ 12,500