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Leases - Activity for Reserves Related to Billed Rents and Straight-line Rents (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
Operating Leased Assets [Line Items]  
Balance at Beginning of Period $ 45,408
Charged to Expenses 3,882
Deductions (1,337)
Balance at End of Period 47,953
Allowance for Credit Loss - Billed Rents  
Operating Leased Assets [Line Items]  
Balance at Beginning of Period 30,366
Charged to Expenses 3,065
Deductions (1,162)
Balance at End of Period 32,269
Straight-line Rent Reserves  
Operating Leased Assets [Line Items]  
Balance at Beginning of Period 15,042
Charged to Expenses 817
Deductions (175)
Balance at End of Period $ 15,684