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Major Accounting Policies - Goodwill (Details)
€ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 01, 2016
EUR (€)
Mar. 01, 2016
USD ($)
Goodwill        
Goodwill $ 564,683 $ 532,239    
Goodwill impairment        
Goodwill impaired $ 0      
Stork Holding B.V.        
Goodwill        
Goodwill     € 383,734 $ 417,310