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Debt Debt - Encumbered Properties (Details) $ in Thousands | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) property
--- | --- | ---
Debt Instrument [Line Items] |  |
Net Book Value | $ 8,245,388 | $ 7,986,276
Encumbered Properties |  |
Debt Instrument [Line Items] |  |
Number of Properties | property | 17,985 | 18,001
Net Book Value | $ 2,401,181 | $ 2,468,887
Encumbered Properties | AH4R 2014-SFR2 securitization |  |
Debt Instrument [Line Items] |  |
Number of Properties | property | 4,537 | 4,543
Net Book Value | $ 575,634 | $ 592,203
Encumbered Properties | AH4R 2014-SFR3 securitization |  |
Debt Instrument [Line Items] |  |
Number of Properties | property | 4,581 | 4,587
Net Book Value | $ 624,279 | $ 642,189
Encumbered Properties | AH4R 2015-SFR1 securitization |  |
Debt Instrument [Line Items] |  |
Number of Properties | property | 4,695 | 4,696
Net Book Value | $ 624,269 | $ 641,595
Encumbered Properties | AH4R 2015-SFR2 securitization |  |
Debt Instrument [Line Items] |  |
Number of Properties | property | 4,172 | 4,175
Net Book Value | $ 576,999 | $ 592,900

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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