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CONCENTRATION OF CREDIT RISK - Narrative (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2020 USD ($) senior_housing | Sep. 30, 2020 USD ($) province property state | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) province property state | Sep. 30, 2019 USD ($) | Jan. 01, 2022 | Jul. 31, 2020 USD ($) property $ / shares shares | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Concentration Risk |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  | 1,200 |  | 1,200 |  |  |  |  |
Cash and cash equivalents |  | $ 588,343,000 |  | $ 588,343,000 |  |  |  |  | $ 106,363,000
Non-mortgage loans receivable, net |  | 56,844,000 |  | 56,844,000 |  |  |  |  | 63,724,000
Rental income |  | 354,512,000 | $ 408,322,000 | 1,126,934,000 | $ 1,208,388,000 |  |  |  |
Secured/mortgage loans and other, net |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Debt securities, held-to-maturity |  | $ 555,483,000 |  | $ 555,483,000 |  |  |  |  | $ 645,546,000
Consolidated Seniors Housing Communities |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  | 431 |  | 431 |  |  |  |  |
Brookdale Senior Living |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  | $ 162,000,000 |  |
Non-mortgage loans receivable, net |  |  |  |  |  |  | $ 45,000,000 |  |
Loan receivable, interest rate |  |  |  |  |  |  | 9.00% |  |
Loan receivable, interest rate annual increase |  |  |  |  |  |  | 0.50% |  |
Number of securities called by warrants | shares |  |  |  |  |  |  | 16.3 |  |
Warrants, exercise price | $ / shares |  |  |  |  |  |  | $ 3.00 |  |
Lessor, Operating Lease, Payments to be Received, Next Rolling Twelve Months |  |  |  |  |  |  | $ 100,000,000 |  |
Warrants and Rights Outstanding |  |  |  |  |  |  | 28,000,000 |  |
Brookdale Senior Living | Up-front Payment Arrangement [Member] |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Deferred Revenue |  |  |  |  |  |  | $ 235,000,000 |  |
Brookdale Senior Living | Forecast |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Annual increase of lease payment |  |  |  |  |  | 3.00% |  |  |
Brookdale Senior Living | Secured/mortgage loans and other, net |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Debt securities, held-to-maturity |  |  |  |  |  |  |  | $ 78,000,000 |
Brookdale Senior Living | Collateral Pledged [Member] |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  |  |  |  | 5 |  |
Brookdale Senior Living | Transfer of escrow deposit to cash [Member] |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  | $ 47,000,000 |  |
Atria and Sunrise | Consolidated Seniors Housing Communities |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  | 258 |  | 258 |  |  |  |  |
Holiday Management Company |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Number of real estate properties | senior_housing | 26 |  |  |  |  |  |  |  |
Loans and leases receivable, allowance | $ 49,600,000 |  |  |  |  |  |  |  |
Lease termination consideration received | 99,800,000 |  |  |  |  |  |  |  |
Gain (Loss) on Contract Termination | 50,200,000 |  |  |  |  |  |  |  |
Holiday Management Company | Secured/mortgage loans and other, net |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Debt securities, held-to-maturity | 66,000,000 |  |  |  |  |  |  |  |
Holiday Management Company | Transfer of escrow deposit to cash [Member] |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 33,800,000 |  |  |  |  |  |  |  |
Customer Concentration Risk | Total Gross Book Value of Properties | Hospitals, Medical Office Building and Other |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  | 36.30% |  |  |  |  |
Customer Concentration Risk | Total Gross Book Value of Properties | Senior Living Operations | Senior Housing Communities |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  | 47.30% |  |  |  |  |
Customer Concentration Risk | Total Gross Book Value of Properties | Triple-Net Leased Properties | Senior Housing Communities |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  | 16.40% |  |  |  |  |
Customer Concentration Risk | Total Gross Book Value of Properties | Atria |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  | 20.60% |  |  |  |  |
Customer Concentration Risk | Total Gross Book Value of Properties | Sunrise |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  | 10.40% |  |  |  |  |
Customer Concentration Risk | Total Gross Book Value of Properties | Brookdale Senior Living |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  | 8.10% |  |  |  |  |
Customer Concentration Risk | Total Gross Book Value of Properties | Ardent |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  | 4.90% |  |  |  |  |
Customer Concentration Risk | Total Gross Book Value of Properties | Kindred |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  | 1.10% |  |  |  |  |
Geographic Concentration Risk |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Number of states in which entity operates | state |  | 45 |  | 45 |  |  |  |  |
Number of states accounting for more than 10% of total revenues and net operating income | state |  | 1 |  | 1 |  |  |  |  |
Continuing revenues and NOI threshold |  |  |  | 10.00% |  |  |  |  |
Geographic Concentration Risk | CANADA |  |  |  |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |  |  |  |
Number of Canadian provinces in which entity operates | province |  | 7 |  | 7 |  |  |  |  |

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