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Property and equipment - Summary by type (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property and equipment    
Total property and equipment $ 544,986 $ 502,646
Less: accumulated depreciation and amortization (247,056) (240,287)
Total property and equipment, net 297,930 262,359
Leasehold improvements    
Property and equipment    
Total property and equipment 433,130 418,023
Software    
Property and equipment    
Total property and equipment 49,675 42,281
Construction in progress    
Property and equipment    
Total property and equipment 46,649 27,291
Computer equipment    
Property and equipment    
Total property and equipment 13,666 13,245
Furniture, fixtures and office equipment    
Property and equipment    
Total property and equipment $ 1,866 $ 1,806