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Investments - Schedule of securities at acquisition reconciliation between purchase price and par value (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]        
Par $ 46,485 $ 0 $ 46,485 $ 11,970
Discount (5,425) 0 (5,425) (2,335)
Allowance (1,593) 0 (1,593) (2,553)
Purchase Price $ 39,467 $ 0 $ 39,467 $ 7,082