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Leases - Paasheuvelweg, Amsterdam (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2017
item
Dec. 31, 2016
USD ($)
Leases      
Future minimum lease payments     $ 39,355
Lease for Facility in Paasheuvelweg, Amsterdam, Netherlands      
Leases      
Lease term (in years) 16 years    
Renewal term (in years) 5 years    
Future minimum lease payments     $ 23,400
Lease for Facility in Paasheuvelweg, Amsterdam, Netherlands | Forecast      
Leases      
Number of facility sites consolidated into new site | item   3