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Business segments (Assets by Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Assets	$ 1,835,192	$ 1,886,042
Operating Segments
Segment Reporting Information [Line Items]
Assets	1,835,192	1,886,042	$ 2,214,102
Operating Segments | Drilling & Subsea
Segment Reporting Information [Line Items]
Assets	786,455	912,324	1,204,416
Operating Segments | Completions
Segment Reporting Information [Line Items]
Assets	675,987	728,745	726,972
Operating Segments | Production & Infrastructure
Segment Reporting Information [Line Items]
Assets	175,940	187,741	231,771
Operating Segments | Corporate
Segment Reporting Information [Line Items]
Assets	$ 196,810	$ 57,232	$ 50,943

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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.

+ Details

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