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Property and equipment, net - Property and equipment, net (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property and equipment, net    
Property and Equipment, gross $ 451,788 $ 422,982
Less accumulated depreciation and amortization (113,457) (103,231)
Property and Equipment, net 338,331 319,751 [1]
Office equipment    
Property and equipment, net    
Property and Equipment, gross 15,199 16,955
Laboratory equipment    
Property and equipment, net    
Property and Equipment, gross 63,339 61,697
Computer equipment    
Property and equipment, net    
Property and Equipment, gross 58,389 55,436
Land    
Property and equipment, net    
Property and Equipment, gross 10,068 10,122
Building and leasehold improvements    
Property and equipment, net    
Property and Equipment, gross 213,529 213,196
Operating lease right-of-use assets    
Property and equipment, net    
Property and Equipment, gross 24,334  
Finance lease right-of-use assets    
Property and equipment, net    
Property and Equipment, gross 2,332  
Construction in Progress    
Property and equipment, net    
Property and Equipment, gross $ 64,598 $ 65,576
[1] The condensed consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date.