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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.

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

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

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Claim Settlement Receivable (Details) - USD ($) $ in Thousands		1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 24, 2016	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2017
Receivables
Litigation settlement receivable					$ 5,400		$ 5,400			$ 5,280
BP Exploration & Production Inc.
Receivables
Claim settlement	$ 13,200
Litigation settlement amount received		$ 2,700	$ 2,700	$ 5,000
Litigation settlement payment 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	$ 200
BP Exploration & Production Inc. \| Maximum
Receivables
Interest income					$ 100
Other income \| BP Exploration & Production Inc.
Receivables
Claim settlement									$ 12,500