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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