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Other Investments - Safehold Inc. (Details)
$ / shares in Units, shares in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 02, 2019
director
Jun. 30, 2020
Mar. 31, 2020
USD ($)
shares
Aug. 31, 2019
Feb. 28, 2019
Jan. 31, 2019
USD ($)
$ / shares
shares
May 31, 2018
USD ($)
office_building
Oct. 31, 2017
USD ($)
Sep. 30, 2020
USD ($)
multiple
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
multiple
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Aug. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]                            
Equity interest (as a percent)                   50.00%   50.00%    
Number of limited partnership units purchased (in shares) | shares           12.5                
Investor units, purchase price per unit (in dollars per share) | $ / shares           $ 20.00                
Additional cash investment in equity method investment           $ 250,000,000.0         $ 194,775,000 $ 494,339,000    
Restriction period on common stock received as payment                     2 years      
Management agreement, termination fee as multiple of prior year management fee | multiple                 3   3      
Commitment to provide loan to lessee                         $ 150,000,000.0  
SAFE                            
Schedule of Equity Method Investments [Line Items]                            
Ground lease term (in years)   99 years   99 years 98 years             99 years    
SAFE                            
Schedule of Equity Method Investments [Line Items]                            
Equity interest (as a percent)                 65.80%   65.80%      
Ground Lease, Atlanta medical office                            
Schedule of Equity Method Investments [Line Items]                            
Commitment to provide loan to lessee                           $ 24,000,000.0
Amount of loan funded                           $ 18,400,000
Interest income                   $ 300,000   $ 1,200,000    
Multifamily Development San Jose                            
Schedule of Equity Method Investments [Line Items]                            
Amount of loan funded                 $ 59,100,000   $ 59,100,000      
Interest income                 900,000 400,000 2,500,000 700,000    
Lessor, operating lease, term of contract (in years)               99 years            
Real estate, leasehold improvement allowance               $ 7,200,000            
Proceeds from sale of ground lease                 34,000,000.0   34,000,000.0      
Gain on sale of ground lease                     6,100,000      
Multifamily Development San Jose | Leasehold First Mortgage                            
Schedule of Equity Method Investments [Line Items]                            
Commitment to provide loan to lessee               80,500,000            
Carrying value of loans               $ 80,500,000            
Ground Lease, Multi-tenant Office Atlanta                            
Schedule of Equity Method Investments [Line Items]                            
Commitment to provide loan to lessee             $ 19,900,000              
Interest income                   500,000   1,600,000    
Number of office buildings | office_building             2              
Ground Lease, Washington DC building conversion                            
Schedule of Equity Method Investments [Line Items]                            
Commitment to provide loan to lessee           $ 13,300,000                
Interest income                 300,000 300,000 800,000 700,000    
SAFE                            
Schedule of Equity Method Investments [Line Items]                            
Expense reimbursements from related party                 1,300,000 500,000 3,800,000 1,600,000    
Management Fees | SAFE                            
Schedule of Equity Method Investments [Line Items]                            
Management fee revenue from related party                 3,200,000 $ 1,900,000 $ 9,300,000 $ 5,000,000.0    
Fee percent of SAFE Equity up to $1.5 billion                            
Schedule of Equity Method Investments [Line Items]                            
Management fee as percent of equity                     1.00%      
Fee percent of SAFE Equity up to $1.5 billion | Maximum                            
Schedule of Equity Method Investments [Line Items]                            
Management fee equity threshold amount                 1,500,000,000   $ 1,500,000,000      
Fee percent of SAFE Equity between $1.5 billion and $3.0 billion                            
Schedule of Equity Method Investments [Line Items]                            
Management fee as percent of equity                     1.25%      
Fee percent of SAFE Equity between $1.5 billion and $3.0 billion | Maximum                            
Schedule of Equity Method Investments [Line Items]                            
Management fee equity threshold amount                 3,000,000,000.0   $ 3,000,000,000.0      
Fee percent of SAFE Equity between $1.5 billion and $3.0 billion | Minimum                            
Schedule of Equity Method Investments [Line Items]                            
Management fee equity threshold amount                 1,500,000,000   $ 1,500,000,000      
Fee percent of SAFE Equity between $3.0 billion and $5.0 billion                            
Schedule of Equity Method Investments [Line Items]                            
Management fee as percent of equity                     1.375%      
Fee percent of SAFE Equity between $3.0 billion and $5.0 billion | Maximum                            
Schedule of Equity Method Investments [Line Items]                            
Management fee equity threshold amount                 5,000,000,000.0   $ 5,000,000,000.0      
Fee percent of SAFE Equity between $3.0 billion and $5.0 billion | Minimum                            
Schedule of Equity Method Investments [Line Items]                            
Management fee equity threshold amount                 3,000,000,000.0   $ 3,000,000,000.0      
Fee percent of SAFE Equity over $5.0 billion                            
Schedule of Equity Method Investments [Line Items]                            
Management fee as percent of equity                     1.50%      
Fee percent of SAFE Equity over $5.0 billion | Minimum                            
Schedule of Equity Method Investments [Line Items]                            
Management fee equity threshold amount                 $ 5,000,000,000.0   $ 5,000,000,000.0      
SAFE | Private Placement                            
Schedule of Equity Method Investments [Line Items]                            
Shares acquired (in shares) | shares     1.7                      
Value of common stock issued in private placement     $ 80,000,000.0                      
Real estate equity investments | SAFE                            
Schedule of Equity Method Investments [Line Items]                            
Voting power cap threshold (as a percent) 41.90%                          
Number of director nominees | director 3                          
Independent period 3 years                          
Standstill provisions (in years) 2 years                          
Exchange shares restriction period 1 year                          
Stock transfer limitation maximum per agreement, other than widely distributed public offering (as a percent) 20.00%