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v3.20.1

Fair Value of Assets and Liabilities - Assets and Liabilities (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) property shares | Mar. 31, 2019 USD ($) | Jan. 01, 2020 USD ($) shares | Dec. 31, 2019 shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Common shares of beneficial interest, shares issued (in shares) | shares | 237,893,725 |  |  | 237,897,163
Common shares of beneficial interest, shares outstanding (in shares) | shares | 237,893,725 |  |  | 237,897,163
Impairment of assets | $ 11,234 | $ 6,206 |  |
Gains and losses on equity securities, net | $ (9,943) | $ 22,932 |  |
Five Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Common shares of beneficial interest, shares issued (in shares) | shares |  |  | 10,268,158 |
Five Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities investment (in shares) | shares | 10,691,658 |  |  |
Initial cost basis | $ 44,448 |  | $ 38,095 |
Common shares of beneficial interest, shares outstanding (in shares) | shares |  |  |  | 423,500
Gains and losses on equity securities, net | (9,943) |  |  |
Recurring | Five Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in affiliates, fair value | 29,723 |  |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Five Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in affiliates, fair value | 29,723 |  |  |
Recurring | Significant Other Observable Inputs (Level 2) | Five Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in affiliates, fair value | 0 |  |  |
Recurring | Significant Unobservable Inputs (Level 3) | Five Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in affiliates, fair value | 0 |  |  |
Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Real estate properties held for sale | 98,927 |  |  |
Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Real estate properties held for sale | 0 |  |  |
Nonrecurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Real estate properties held for sale | 98,927 |  |  |
Nonrecurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Real estate properties held for sale | $ 0 |  |  |
Common Shares | Five Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities investment (in shares) | shares | 10,691,658 |  |  |
Medical Office Buildings |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Number of real estate properties held for sale | property | 10 |  |  |
Medical Office Buildings | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Sale price less estimated cost to sell | $ 1,658 |  |  |
Medical Office Buildings | Held-for-sale, Not Discontinued Operations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impairment of assets | 6,505 |  |  |
Medical Office Buildings | Held-for-sale, Not Discontinued Operations | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impairment of assets | $ 6,544 |  |  |
Number of real estate properties held for sale | property | 6 |  |  |
Sale price less estimated cost to sell | $ 51,640 |  |  |
Senior Living Communities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Number of real estate properties held for sale | property | 14 |  |  |
Senior Living Communities | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Sale price less estimated cost to sell | $ 49,600 |  |  |
Senior Living Communities | Held-for-sale, Not Discontinued Operations | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impairment of assets | $ 5,581 |  |  |
Number of real estate properties held for sale | property | 5 |  |  |
Sale price less estimated cost to sell | $ 655 |  |  |

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