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Investing Receivables (Tables)
 9 Months Ended
Sep. 30, 2017
Receivables [Abstract]  
Schedule of investing receivables
Investing receivables, including accrued interest thereon, consisted of the following (in thousands):
 
 
September 30,
2017
 
December 31,
2016
Notes receivable from the City of Huntsville
$
53,088

 
$
49,258

Other investing loans receivable
3,020

 
3,021

 
$
56,108

 
$
52,279