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Leases - Narrative (Details)
$ in Millions
1 Months Ended 9 Months Ended
Dec. 01, 2017
May 31, 2017
facility
Jun. 30, 2016
Mar. 31, 2016
Nov. 30, 2013
item
Sep. 30, 2018
USD ($)
Lexington            
Leases            
Lease term (in years)         10 years  
Number of subsequent renewals | item         2  
Renewal term (in years)         5 years  
Amsterdam            
Leases            
Lease term (in years) 10 years     16 years    
Renewal term (in years)     5 years      
Number of facility sites consolidated into new site | facility   3        
Minimum rentals to be received | $           $ 9.9