| **Claim Settlement Receivable (Details) - USD ($) $ in Thousands**  |         |          | 9 Months Ended | 12 Months Ended |
|---------------------------------------------------------------------|---------|----------|----------------|-----------------|
||
| **Receivables with Imputed Interest [Line Items]**                  |    |     |           |            |   |   |
| Litigation settlement amount                                        |    |     |           |            |   | $ 1,800 |
| Litigation settlement receivable                                    |    |     | $ 7,804        | $ 7,804         | $ 0 |   |
| Litigation settlement proceeds                                      |    |     |           | 12,548          | $ 0 | $ 0 |
| BP Exploration & Production Inc.                                |    |     |           |            |   |   |
| **Receivables with Imputed Interest [Line Items]**                  |    |     |           |            |   |   |
| Litigation settlement amount                                        |    | $ 13,200 |           |            |   |   |
| Litigation settlement amount received                               | $ 5,000 |     |           |            |   |   |
| Litigation settlement receivable due in October 2017, 2018 and 2019 |    | $ 2,700  |           |            |   |   |
| Imputed interest rate on litigation settlement receivable           |    | 3.00%    |           |            |   |   |
| Litigation settlement receivable                                    |    | $ 12,500 | 7,800          | 7,800           |   |   |
| Unamortized discount                                                |    | $ 700    |           |            |   |   |
| Interest income, operating                                          |    |     | $ 300          |            |   |   |
| Other income | BP Exploration & Production Inc.                 |    |     |           |            |   |   |
| **Receivables with Imputed Interest [Line Items]**                  |    |     |           |            |   |   |
| Litigation settlement proceeds                                      |    |     |           | $ 12,500        |   |   |

| X                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Litigation Settlement, Amount, Gross, Due in Years Two, Three and Four
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.
+ References
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| X                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of judgment or settlement awarded to (against) the entity in respect of litigation.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Cash received for the settlement of litigation during the current period.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The receivable or note face amount less the unamortized discount or premium.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
No definition available.
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| X                                                                                                                                                          |
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| X                                                                                                                                                                        |
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