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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 ($)
office_building
Oct. 31, 2017
USD ($)
unit
Mar. 31, 2019
USD ($)
multiple
Mar. 31, 2018
USD ($)
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       $ 260,297,000 $ 43,391,000        
Management agreement, termination fee as multiple of prior year management fee | multiple       3          
Management agreement, equity raised since inception metric related to renewal and termination       $ 820,000,000          
Carrying value of loans       $ 844,624,000       $ 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       $ 1,500,000,000.0          
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       $ 1,500,000,000.0          
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          
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          
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          
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          
SAFE | Real estate equity investments                  
Schedule of Equity Method Investments [Line Items]                  
Equity interest (percent)       42.40%          
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                
Investor Units as percent of fully diluted economic interest (percent)       40.60%          
Equity interest including both common stock and Investor Units (percent)       65.80%          
Voting power cap threshold (percent) 41.90%     41.90%          
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
Amount of loan funded       $ 18,000,000          
Interest income       500,000 $ 200,000        
Great Oaks                  
Schedule of Equity Method Investments [Line Items]                  
Lessor, operating lease, term of contract     99 years            
Number of units in real estate property to be built | unit     301            
Real estate, leasehold improvement allowance     $ 7,200,000            
Forward purchase contract, purchase agreement, amount     34,000,000            
Ground Lease, 100 and 200 Glenridge Point                  
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       600,000          
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       11,900,000          
Interest income       200,000          
SAFE                  
Schedule of Equity Method Investments [Line Items]                  
Management fees waived       900,000          
Expense reimbursements from related party           $ 500,000      
Expense reimbursement waived       400,000          
Management Fees | SAFE                  
Schedule of Equity Method Investments [Line Items]                  
Management fee revenue from related party       $ 1,500,000          
Leasehold First Mortgage | Great Oaks                  
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