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Business segments (Assets by Segment) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 1,854,569 | $ 1,886,042
Operating Segments | Drilling & Subsea |  |
Segment Reporting Information [Line Items] |  |
Assets | 885,418 | 912,324
Operating Segments | Completions |  |
Segment Reporting Information [Line Items] |  |
Assets | 728,531 | 728,745
Operating Segments | Production & Infrastructure |  |
Segment Reporting Information [Line Items] |  |
Assets | 188,211 | 187,741
Corporate, Non-Segment |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 52,409 | $ 57,232

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