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Receivables (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Receivables [Abstract]    
Accounts receivable $ 24,900,000 $ 22,100,000
Accounts receivable, allowance for doubtful accounts 200,000 0
Straight-line rent receivables, gross 241,300,000 226,000,000
Allowance for straight-line rent receivables $ 31,000 $ 300,000