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Notes and Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Components of notes and accounts receivables
At December 31, 2018 and 2017, notes and accounts receivables included the following (in thousands):
 
2018
 
2017
Notes receivable
$
453

 
$
465

Tenant and other receivables
13,997

 
14,490

Allowance for doubtful accounts related to tenant and other receivables
(629
)
 
(535
)
 
$
13,821

 
$
14,420