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Receivables (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Receivables [Abstract]    
Accounts receivable $ 19,600,000 $ 22,100,000
Accounts receivable, allowance for doubtful accounts 0 0
Straight-line rent receivables, gross 233,000,000.0 226,000,000.0
Allowance for straight-line rent receivables $ 200,000 $ 300,000