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Other Assets - Retained Interest Investments (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Investments    
Retained interest investments $ 13,331 $ 12,905
Retained interest investments    
Investments    
Expected amount to receive upon maturity of note after payment of note and any other liabilities $ 16,500  
Promissory notes maturity period 15 years  
Retained interest investments $ 13,300 $ 12,900
Minimum | Retained interest investments    
Investments    
Notes maturity year 2022  
Maximum | Retained interest investments    
Investments    
Notes maturity year 2024