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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

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