Income Tax Examination, Number of Years Under Review

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Income Tax Examination, Settlement Agreement, Number of Tax Years

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Number of Subsidiaries Involved in Loss Contingency

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- Definition

Oil and Gas Contingencies, Number of Barrels Spilled

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Purchase Obligation, Milestone Payments

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

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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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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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Commitments and Contingent Liabilities (Details) $ in Millions			1 Months Ended		6 Months Ended
	Mar. 22, 2015 bbl	May. 23, 2014 USD ($)	Sep. 30, 2014 USD ($)	Nov. 30, 2013 USD ($) subsidiary	Apr. 24, 2014 USD ($)	Jun. 30, 2015 USD ($)
Oil and Gas Delivery Commitments and Contracts [Line Items]
Settlement agreement, number of years			3 years
Number of years under review			4 years
Number of barrels spilled \| bbl	2,200
Outstanding letters of credit						$ 11.9
HS Ocean Group Ltd. [Member] \| Loss on Purchase Contract [Member]
Oil and Gas Delivery Commitments and Contracts [Line Items]
Number of subsidiaries involved in loss contingency \| subsidiary				1
Lump-sum contract value				$ 20.0
Milestone payments					$ 10.9
Asserted claims		$ 25.0
Estimated liability						$ 5.0
Current Income Tax Receivable [Member]
Oil and Gas Delivery Commitments and Contracts [Line Items]
Tax benefits recognized from settlement			$ 36.0