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Business segments (Assets by Segment) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Assets $ 2,168,869 $ 1,892,980  
Operating Segments [Member]
      
Segment Reporting Information [Line Items]      
Assets 2,168,869 1,892,980 1,607,315
Operating Segments [Member] | Drilling & Subsea [Member]
      
Segment Reporting Information [Line Items]      
Assets 1,655,355 1,413,944 1,193,128
Operating Segments [Member] | Production & Infrastructure [Member]
      
Segment Reporting Information [Line Items]      
Assets 468,520 435,496 388,570
Operating Segments [Member] | Corporate [Member]
      
Segment Reporting Information [Line Items]      
Assets $ 44,994 $ 43,540 $ 25,617