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Leases - Summary of Residential and Non-Residential Accounts Receivable and Straight-Line Receivable Balances (Details) - Other Assets [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Resident/tenant accounts receivable balances | $ 30,856 | $ 4,040
Allowance for doubtful accounts | (24,021) | (1,190)
Net receivable balances | 6,835 | 2,850
Straight-line receivable balances | 19,992 | 1,841
Non-Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Resident/tenant accounts receivable balances | 7,598 | 1,766
Allowance for doubtful accounts | (6,527) | (1,412)
Net receivable balances | 1,071 | 354
Straight-line receivable balances | $ 13,413 | $ 26,450

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- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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