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Property and Equipment, net - Property and equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property and equipment, net      
Property and Equipment, gross $ 703,999 $ 499,437  
Less accumulated depreciation and amortization (144,374) (121,870)  
Property and Equipment, net 559,625 377,567  
Depreciation expense including amortization expense of leasehold improvements 29,600 32,100 $ 32,300
Office equipment      
Property and equipment, net      
Property and Equipment, gross 17,880 15,303  
Laboratory equipment      
Property and equipment, net      
Property and Equipment, gross 86,021 70,510  
Computer equipment      
Property and equipment, net      
Property and Equipment, gross 66,640 59,069  
Land      
Property and equipment, net      
Property and Equipment, gross 10,671 10,203  
Building and leasehold improvements      
Property and equipment, net      
Property and Equipment, gross 238,042 208,293  
Operating lease right-of-use assets      
Property and equipment, net      
Property and Equipment, gross 26,816 19,672  
Construction in Progress      
Property and equipment, net      
Property and Equipment, gross $ 257,929 $ 116,387