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Investing Receivables (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Schedule of investing receivables
Investing receivables, including accrued interest thereon, consisted of the following (in thousands):
 
 
 
December 31,
 
 
2016
 
2015
Notes receivable from City of Huntsville
 
$
49,258

 
$
44,875

Other investing loans receivable
 
3,021

 
3,000

 
 
$
52,279

 
$
47,875