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Other Investments - Safehold Inc. (Details)
$ / shares in Units, shares in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 02, 2019
director
Mar. 31, 2020
USD ($)
shares
Feb. 28, 2019
Jan. 31, 2019
USD ($)
$ / shares
shares
May 31, 2018
USD ($)
office_building
Oct. 31, 2017
USD ($)
Jun. 30, 2020
USD ($)
multiple
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
multiple
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Aug. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]                        
Equity interest (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         $ 141,091,000 $ 310,812,000    
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]                        
Equity interest (percent)             65.40%   65.40%      
SAFE | Real estate equity investments                        
Schedule of Equity Method Investments [Line Items]                        
Voting power cap threshold (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 (percent) 20.00%                      
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               $ 500,000   900,000    
Multifamily Development San Jose                        
Schedule of Equity Method Investments [Line Items]                        
Amount of loan funded             $ 52,900,000   $ 52,900,000      
Interest income             800,000 200,000 1,500,000 300,000    
Lessor, operating lease, term of contract           99 years            
Real estate, leasehold improvement allowance           $ 7,200,000            
Forward purchase contract, purchase agreement, amount           34,000,000.0            
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   1,100,000    
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                
Amount of loan funded             13,100,000   13,100,000      
Interest income             300,000 200,000 500,000 400,000    
SAFE                        
Schedule of Equity Method Investments [Line Items]                        
Expense reimbursements from related party             1,300,000 500,000 2,500,000 1,100,000    
Management Fees | SAFE                        
Schedule of Equity Method Investments [Line Items]                        
Management fee revenue from related party             3,200,000 $ 1,500,000 $ 6,000,000.0 $ 3,100,000    
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 | 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 $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 $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 | 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 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 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                        
Schedule of Equity Method Investments [Line Items]                        
Ground lease term (in years)     98 years           99 years      
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