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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Lessor, Operating Leases, ASC 842 Disclosure The following table sets forth the undiscounted cash flows for future minimum base rents to be received from customers for leases in effect at December 31, 2020 for the properties that we wholly own:
2021$623,888 
2022619,530 
2023570,417 
2024513,483 
2025432,272 
Thereafter2,049,545 
$4,809,135 
  
Allowance For Doubtful Accounts  
The following table sets forth the activity of allowance for doubtful accounts:
Balance at December 31, 2017AdditionsDeductionsBalance at December 31, 2018
Allowance for Doubtful Accounts - Straight-Line Rent$819 $599 $(777)$641 
Allowance for Doubtful Accounts - Accounts Receivable753 969 (556)1,166 
Allowance for Doubtful Accounts - Notes Receivable72 — (28)44 
Totals$1,644 $1,568 $(1,361)$1,851 
Lessee, Operating Leases, ASC 842 Disclosure
The following table sets forth the undiscounted cash flows of our scheduled obligations for future minimum payments on operating ground leases at December 31, 2020 and a reconciliation of those cash flows to the operating lease liability at December 31, 2020:

2021$2,127 
20222,169 
20232,167 
20242,123 
20252,170 
Thereafter81,527 
92,283 
Discount(57,892)
Lease liability$34,391