Quarterly report pursuant to Section 13 or 15(d)

Investments in Debt Securities (Components of Investments in Debt Securities) (Details)

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Investments in Debt Securities (Components of Investments in Debt Securities) (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Investments in Debt Securities [Abstract]  
Adjusted cost $ 19,332
Gross unrealized losses (36)
Fair value $ 19,296