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Acquisitions (Details) - USD ($)
$ in Thousands
Sep. 05, 2017
Aug. 13, 2017
Sep. 30, 2017
Dec. 31, 2016
Acquisitions        
Goodwill     $ 173,321 $ 166,917
Stavanger Based Robotic Drilling Systems AS        
Acquisitions        
Cash paid for acquisitions of businesses $ 50,900      
Recorded intangible assets 53,300      
Goodwill 5,700      
Other liabilities $ 7,300      
Common Shares | Tesco Corporation        
Acquisitions        
Number of shares exchanged per common stock of acquiree   0.68    
Number of common shares to be issued   32,000,000