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Investing Receivables (Tables)
6 Months Ended
Jun. 30, 2021
Receivables [Abstract]  
Schedule of investing receivables
Investing receivables consisted of the following (in thousands): 
June 30,
2021
December 31, 2020
Notes receivable from the City of Huntsville$69,165 $65,564 
Other investing loans receivable6,040 6,041 
Amortized cost basis75,205 71,605 
Allowance for credit losses(2,132)(2,851)
Investing receivables, net
$73,073 $68,754