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Goodwill and Intangible Assets - Acquired Intangible Assets (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible assets $ 490,760
Customer relationships  
Acquired Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible assets acquired $ 97,400
Remaining amortization period 15 years
Galapagos operating license  
Acquired Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible assets acquired $ 32,300
Remaining amortization period 26 years
Other finite-life intangible assets  
Acquired Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible assets acquired $ 11,560
Remaining amortization period 2 years
Silversea Cruises trade name  
Acquired Finite-Lived Intangible Assets [Line Items]  
Indefinite-lived intangible assets acquired $ 349,500