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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets    
Gross Carrying Value $ 26,817 $ 26,817
Accumulated Amortization Expense (22,946) (22,059)
Total intangible assets 3,871 4,758
Titles, content and technology    
Finite-Lived Intangible Assets    
Gross Carrying Value 21,117 21,117
Accumulated Amortization Expense (17,246) (16,359)
Total intangible assets $ 3,871 4,758
Titles, content and technology | Minimum    
Finite-Lived Intangible Assets    
Estimated Useful Life 3 years  
Titles, content and technology | Maximum    
Finite-Lived Intangible Assets    
Estimated Useful Life 5 years  
Customer contracts and related relationships    
Finite-Lived Intangible Assets    
Estimated Useful Life 5 years  
Gross Carrying Value $ 700 700
Accumulated Amortization Expense $ (700) (700)
Trademarks    
Finite-Lived Intangible Assets    
Estimated Useful Life 7 years  
Gross Carrying Value $ 5,000 5,000
Accumulated Amortization Expense $ (5,000) $ (5,000)