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Investing Receivables (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of investing receivables
Investing receivables, including accrued interest thereon, consisted of the following (in thousands):
 
 
 
December 31,
 
 
2018
 
2017
Notes receivable from City of Huntsville
 
$
53,961

 
$
54,472

Other investing loans receivable
 
3,021

 
3,021

 
 
$
56,982

 
$
57,493