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Long-Lived Assets - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 154,955 $ 115,078
Less accumulated depreciation and amortization (67,596) (55,174)
Property and equipment, net 87,359 59,904
Computer and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,355 3,140
Internal-use software and website development    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 7,552 4,043
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,640 2,912
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 17,738 14,167
Content    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 122,670 $ 90,816