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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Note 3 - Impairment Charges (Details Textual) $ in Thousands	3 Months Ended			6 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($) $ / item	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2016 USD ($) $ / item	Dec. 31, 2016 USD ($) $ / item	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Oil Price \| $ / item	30			40	50
Goodwill, Impairment Loss						$ 22,554
Asset Impairment Charges				$ 160,200	162,808	152,103	8,995
Impairment of Long-Lived Assets to be Disposed of	$ 2,600						1,536
Impairment of Intangible Assets (Excluding Goodwill)						13,695
North Sea [Member]
Asset Impairment Charges					$ 1,986	$ 22,919	8,551
Vessel [Member] \| North Sea [Member]
Impairment of Long-Lived Assets to be Disposed of							$ 1,500
North Sea [Member]
Goodwill, Impairment Loss		$ 22,600
Impairment of Long-Lived Assets to be Disposed of	2,000	400	$ 7,500
Americas [Member] \| U.S Gulf of Mexico [Member]
Asset Impairment Charges		129,200
Impairment of Intangible Assets (Excluding Goodwill)		13,700
Americas [Member] \| U.S Gulf of Mexico [Member] \| Vessel [Member]
Impairment of Long-Lived Assets to be Disposed of		$ 115,500
Americas Segment [Member] \| U.S Gulf of Mexico [Member]
Asset Impairment Charges				94,500
Americas Segment [Member] \| Non-U.S. Americas [Member]
Asset Impairment Charges				15,900
Southeast Asia Segment [Member]
Asset Impairment Charges				$ 49,800
Impairment of Long-Lived Assets to be Disposed of	$ 600