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Allowance for Doubtful Accounts (Tables)
 3 Months Ended
Mar. 31, 2018
Receivables [Abstract]  
Schedule of Impaired Financing Receivable
A summary schedule of impaired notes receivable, and the related reserve, for the three months ended March 31, 2018 is as follows:
 
Impaired Notes Receivable

 
Balance
December 31, 2017
 
Additions
 
Deductions
 
Balance
March 31, 2018
 
(in thousands)
Impaired Notes Receivable
$
6,854

 
$
150

 
$
—

 
$
7,004

Reserve for Impaired Notes Receivable
$
2,884

 
$
2,752

 
$
—

 
$
5,636