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Fair Value of Assets and Liabilities - Assets and Liabilities (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Dec. 31, 2019
USD ($)
property
shares
Dec. 31, 2018
USD ($)
property
shares
Dec. 31, 2017
USD ($)
Non-Recurring Fair Value Measurements Assets:        
Unrealized gains (losses) on equity securities, net   $ (41,898) $ (20,724) $ 0
Impairment of assets   $ 115,201 66,346 $ 5,082
Number of properties owned | property   424    
Five Star        
Non-Recurring Fair Value Measurements Assets:        
Unrealized gains (losses) on equity securities, net   $ (462) $ (4,320)  
Impairment of assets $ 5,082      
Five Star | Common Shares        
Non-Recurring Fair Value Measurements Assets:        
Investment in common shares (in shares) | shares   423,500 423,500  
Cost basis for shares owned   $ 6,353    
Recurring | Five Star        
Recurring Fair Value Measurements Assets:        
Investments in Five Star   1,571    
Recurring | Five Star | Level 1        
Recurring Fair Value Measurements Assets:        
Investments in Five Star   1,571    
Recurring | Five Star | Level 2        
Recurring Fair Value Measurements Assets:        
Investments in Five Star   0    
Recurring | Five Star | Level 3        
Recurring Fair Value Measurements Assets:        
Investments in Five Star   0    
Nonrecurring        
Non-Recurring Fair Value Measurements Assets:        
Real estate properties held for sale   88,656    
Real estate properties at fair value   106,850    
Nonrecurring | Level 1        
Non-Recurring Fair Value Measurements Assets:        
Real estate properties held for sale   0    
Real estate properties at fair value   0    
Nonrecurring | Level 2        
Non-Recurring Fair Value Measurements Assets:        
Real estate properties held for sale   88,656    
Real estate properties at fair value   0    
Nonrecurring | Level 3        
Non-Recurring Fair Value Measurements Assets:        
Real estate properties held for sale   0    
Office Portfolio        
Non-Recurring Fair Value Measurements Assets:        
Impairment of assets   $ 43,035 $ 46,797  
Number of properties owned | property   20    
Office Portfolio | Nonrecurring        
Non-Recurring Fair Value Measurements Assets:        
Sale price less estimated cost to sell   $ 71,121    
Office Portfolio | Disposal Group, Held-for-sale, Not Discontinued Operations        
Non-Recurring Fair Value Measurements Assets:        
Number of real estate properties held for sale | property   15 2  
Office Portfolio | Disposal Group, Held-for-sale, Not Discontinued Operations | Nonrecurring        
Non-Recurring Fair Value Measurements Assets:        
Impairment of assets   $ 16,977    
Number of real estate properties held for sale | property   14    
Sale price less estimated cost to sell   $ 2,141    
Senior Living Communities        
Non-Recurring Fair Value Measurements Assets:        
Impairment of assets   $ 72,166    
Number of properties owned | property   25    
Senior Living Communities | Nonrecurring        
Non-Recurring Fair Value Measurements Assets:        
Real estate properties at fair value   $ 106,850    
Impairment of assets   51,797    
Sale price less estimated cost to sell   $ 17,535    
Number of properties owned | property   7    
Senior Living Communities | Disposal Group, Held-for-sale, Not Discontinued Operations        
Non-Recurring Fair Value Measurements Assets:        
Number of real estate properties held for sale | property   2    
Senior Living Communities | Disposal Group, Held-for-sale, Not Discontinued Operations | Nonrecurring        
Non-Recurring Fair Value Measurements Assets:        
Impairment of assets   $ 4,984    
Number of real estate properties held for sale | property   2    
Sale price less estimated cost to sell   $ 515