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Finance Receivables (Tables)
 6 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
Financing Receivable Credit Quality Indicators
A summary of our finance receivables by internal credit quality rating is as follows (dollars in thousands):
 
 
Number of Tenants / Obligors at
 
Carrying Value at
Internal Credit Quality Indicator
 
June 30, 2018
 
December 31, 2017
 
June 30, 2018
 
December 31, 2017
1
 
—
 
—
 
$
—

 
$
—

2
 
2
 
2
 
63,102

 
62,744

3
 
10
 
8
 
390,957

 
379,621

4
 
5
 
8
 
127,111

 
165,413

5
 
2
 
1
 
25,188

 
11,950

 
 
 
 
 
 
$
606,358

 
$
619,728