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Fair Value - Assets and Liabilities that are Measured at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financial assets:    
Fair value $ 83,310 $ 65,601
Total assets 83,310 65,601
Student loan asset-backed securities - available-for-sale    
Financial assets:    
Fair value 57,044 52,597
Equity securities    
Financial assets:    
Fair value 6 6
Equity securities measured at net asset value    
Financial assets:    
Fair value 26,157 12,894
Debt securities - available-for-sale    
Financial assets:    
Fair value 103 104
Level 1    
Financial assets:    
Fair value 109 110
Total assets 109 110
Level 1 | Student loan asset-backed securities - available-for-sale    
Financial assets:    
Fair value 0 0
Level 1 | Equity securities    
Financial assets:    
Fair value 6 6
Level 1 | Debt securities - available-for-sale    
Financial assets:    
Fair value 103 104
Level 2    
Financial assets:    
Fair value 57,044 52,597
Total assets 57,044 52,597
Level 2 | Student loan asset-backed securities - available-for-sale    
Financial assets:    
Fair value 57,044 52,597
Level 2 | Equity securities    
Financial assets:    
Fair value 0 0
Level 2 | Debt securities - available-for-sale    
Financial assets:    
Fair value $ 0 $ 0