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Other Investments - Safehold Inc. (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 02, 2019
USD ($)
$ / shares
shares
May 31, 2018
USD ($)
office_building
Oct. 31, 2017
USD ($)
Jun. 30, 2019
USD ($)
multiple
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
multiple
shares
Jun. 30, 2018
USD ($)
Jan. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]                    
Additional cash investment in equity method investment           $ 310,812,000 $ 53,012,000      
Restriction period on common stock received as payment           2 years        
Management agreement, termination fee as multiple of prior year management fee | multiple       3   3        
Management agreement, equity raised since inception metric related to renewal and termination       $ 820,000,000   $ 820,000,000        
Carrying value of loans       805,940,000   $ 805,940,000     $ 919,493,000  
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 | Real estate equity investments                    
Schedule of Equity Method Investments [Line Items]                    
Number of Investor Units purchased (in shares) | shares 12,500,000                  
Investor Units, purchase price per unit (in dollars per share) | $ / shares $ 20.00                  
Additional cash investment in equity method investment $ 250,000,000.0                  
Equity interest (percent)       66.50%   66.50%        
Voting power cap threshold (percent) 41.90%                  
Standstill provisions (in years) 2 years                  
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       $ 18,000,000.0   $ 18,000,000.0        
Interest income       500,000 $ 300,000 900,000 600,000      
Multifamily Development San Jose                    
Schedule of Equity Method Investments [Line Items]                    
Amount of loan funded       14,900,000   14,900,000        
Interest income       200,000 100,000 300,000 100,000      
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              
Ground Lease, Multi-tenant Office Atlanta                    
Schedule of Equity Method Investments [Line Items]                    
Commitment to provide loan to lessee   $ 19,900,000                
Number of office buildings | office_building   2                
Interest income       500,000 200,000 1,100,000 200,000      
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       12,100,000   12,100,000        
Interest income       200,000   400,000        
SAFE                    
Schedule of Equity Method Investments [Line Items]                    
Management fees waived         900,000   1,800,000      
Expense reimbursements from related party       500,000   1,100,000        
Expense reimbursement waived         $ 400,000   $ 800,000      
Management Fees | SAFE                    
Schedule of Equity Method Investments [Line Items]                    
Management fee revenue from related party       $ 1,500,000   $ 3,100,000        
Leasehold First Mortgage | Multifamily Development San Jose                    
Schedule of Equity Method Investments [Line Items]                    
Commitment to provide loan to lessee     80,500,000              
Carrying value of loans     $ 80,500,000              
SAFE                    
Schedule of Equity Method Investments [Line Items]                    
Ground lease term (in years)           98 years        
SAFE                    
Schedule of Equity Method Investments [Line Items]                    
Common stock received as payment of fees | shares       75,585   121,605