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Goodwill and intangible assets (Schedule of Goodwill) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Roll Forward]      
Goodwill Balance at January 1, net $ 669,036,000 $ 798,481,000  
Acquisitions, net of dispositions 0 13,977,000  
Impairment 0 (123,200,000) $ 0
Impact of non-U.S. local currency translation (16,293,000) (20,222,000)  
Goodwill Balance at December 31, net 652,743,000 669,036,000 798,481,000
Operating Segments | Drilling & Subsea      
Goodwill [Roll Forward]      
Goodwill Balance at January 1, net 334,595,000 472,891,000  
Acquisitions, net of dispositions 0 0  
Impairment 0 (123,200,000)  
Impact of non-U.S. local currency translation (17,189,000) (15,096,000)  
Goodwill Balance at December 31, net 317,406,000 334,595,000 472,891,000
Operating Segments | Completions      
Goodwill [Roll Forward]      
Goodwill Balance at January 1, net 316,914,000 307,448,000  
Acquisitions, net of dispositions 0 13,977,000  
Impairment 0 0  
Impact of non-U.S. local currency translation 779,000 (4,511,000)  
Goodwill Balance at December 31, net 317,693,000 316,914,000 307,448,000
Operating Segments | Production & Infrastructure      
Goodwill [Roll Forward]      
Goodwill Balance at January 1, net 17,527,000 18,142,000  
Acquisitions, net of dispositions 0 0  
Impairment 0 0  
Impact of non-U.S. local currency translation 117,000 (615,000)  
Goodwill Balance at December 31, net $ 17,644,000 $ 17,527,000 $ 18,142,000