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Property and Equipment, net - Property and equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property and equipment, net      
Property and Equipment, gross $ 499,437 $ 422,982  
Less accumulated depreciation and amortization (121,870) (103,231)  
Property and Equipment, net 377,567 319,751  
Depreciation expense including amortization expense of leasehold improvements 32,100 32,300 $ 24,600
Office equipment      
Property and equipment, net      
Property and Equipment, gross 15,303 16,955  
Laboratory equipment      
Property and equipment, net      
Property and Equipment, gross 70,510 61,697  
Computer equipment      
Property and equipment, net      
Property and Equipment, gross 59,069 55,436  
Land      
Property and equipment, net      
Property and Equipment, gross 10,203 10,122  
Building and leasehold improvements      
Property and equipment, net      
Property and Equipment, gross 208,293 213,196  
Operating lease right-of-use assets      
Property and equipment, net      
Property and Equipment, gross 19,672    
Construction in Progress      
Property and equipment, net      
Property and Equipment, gross $ 116,387 $ 65,576