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Investing Receivables (Tables)
 9 Months Ended
Sep. 30, 2019
Receivables [Abstract]  
Schedule of investing receivables
Investing receivables, including accrued interest thereon, consisted of the following (in thousands):
 
 
September 30,
2019
 
December 31,
2018
Notes receivable from the City of Huntsville
$
58,021

 
$
53,961

Other investing loans receivable
14,093

 
3,021

 
$
72,114

 
$
56,982