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Long-Lived Assets - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 224,417 $ 154,955
Less accumulated depreciation and amortization (98,610) (67,596)
Property and equipment, net 125,807 87,359
Content    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 181,938 122,670
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 19,574 17,738
Internal-use software and website development    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 15,646 7,552
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,891 3,640
Computers and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 3,368 $ 3,355