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Supplemental Disclosure of Cash Flow Information - Cash and Restricted Cash (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | $ 26,845 | $ 28,059 |  |
Long-term restricted cash | 64,438 | 56,669 |  |
Total | 91,283 | 84,728 |  |
Reconciliation of cash, cash equivalents, and restricted cash: |  |  |  |
Cash and cash equivalents | 347,031 | 380,420 |  |
Restricted cash | 26,845 | 28,059 |  |
Long-term restricted cash | 64,438 | 56,669 |  |
Total cash, cash equivalents, and restricted cash | 438,314 | 465,148 | $ 301,697 | $ 450,218
Real estate tax and property insurance escrows |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 16,272 | 17,465 |  |
Reconciliation of cash, cash equivalents, and restricted cash: |  |  |  |
Restricted cash | 16,272 | 17,465 |  |
Replacement reserve escrows |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 9,756 | 9,465 |  |
Reconciliation of cash, cash equivalents, and restricted cash: |  |  |  |
Restricted cash | 9,756 | 9,465 |  |
Resident deposits |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 93 | 253 |  |
Reconciliation of cash, cash equivalents, and restricted cash: |  |  |  |
Restricted cash | 93 | 253 |  |
Other |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 724 | 876 |  |
Reconciliation of cash, cash equivalents, and restricted cash: |  |  |  |
Restricted cash | 724 | 876 |  |
Insurance deposits |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Long-term restricted cash | 30,932 | 21,903 |  |
Reconciliation of cash, cash equivalents, and restricted cash: |  |  |  |
Long-term restricted cash | 30,932 | 21,903 |  |
Debt service reserve |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Long-term restricted cash | 18,053 | 17,784 |  |
Reconciliation of cash, cash equivalents, and restricted cash: |  |  |  |
Long-term restricted cash | 18,053 | 17,784 |  |
CCRCs escrows |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Long-term restricted cash | 15,346 | 15,329 |  |
Reconciliation of cash, cash equivalents, and restricted cash: |  |  |  |
Long-term restricted cash | 15,346 | 15,329 |  |
Letters of credit collateral |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Long-term restricted cash | 107 | 1,653 |  |
Reconciliation of cash, cash equivalents, and restricted cash: |  |  |  |
Long-term restricted cash | $ 107 | $ 1,653 |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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