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Other Investments (Safehold Inc). (Details)
$ / shares in Units, shares in Millions, ft² in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 02, 2019
director
Jun. 30, 2021
USD ($)
ft²
agreement
Feb. 28, 2021
USD ($)
Jun. 30, 2020
Mar. 31, 2020
USD ($)
shares
May 31, 2019
Jan. 31, 2019
USD ($)
$ / shares
shares
Oct. 31, 2017
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jan. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]                            
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       $ 91,419,000 $ 141,091,000    
Conversion of stock           1                
Restriction period on common stock received as payment                     2 years      
Management agreement, termination fee as multiple of prior year management fee   3             3   3      
Payment to acquire purchase option agreement                     $ 1,000,000.0      
Expenses incurred in acquisition of purchase option agreement                     200,000      
SAFE                            
Schedule of Equity Method Investments [Line Items]                            
Expense reimbursements from related party                 $ 1,900,000 $ 1,300,000 3,800,000 2,500,000    
Proceeds from sale of purchase option agreement   $ 1,200,000             1,200,000   1,200,000      
Gain recognized on sale of purchase option agreement   $ 0                        
Number of agreements | agreement   2                        
Sale price per agreement for sale of land and related Ground Lease, subject to certain conditions being met   $ 42,000,000.0             $ 42,000,000.0   $ 42,000,000.0      
Multiple required that may trigger receipt of additional consideration   1.25             1.25   1.25      
Percentage of required return on investment that may trigger receipt of additional consideration   9.00%                        
Management Fees | SAFE                            
Schedule of Equity Method Investments [Line Items]                            
Management fee revenue from related party                 $ 3,500,000 3,200,000 $ 7,000,000.0 6,000,000.0    
Maximum | SAFE                            
Schedule of Equity Method Investments [Line Items]                            
Leasehold improvement allowance, Ground Leases   $ 83,000,000.0             83,000,000.0   $ 83,000,000.0      
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   $ 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   $ 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   $ 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   $ 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   $ 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 | Maximum                            
Schedule of Equity Method Investments [Line Items]                            
Management fee equity threshold amount   5,000,000,000.0             5,000,000,000.0   $ 5,000,000,000.0      
Safehold Inc.                            
Schedule of Equity Method Investments [Line Items]                            
Purchase option, purchase price to acquire property   $ 215,000,000.0             $ 215,000,000.0   $ 215,000,000.0      
Purchase option, square feet of future office space development | ft²   1.1                        
Safehold Inc. | 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                  
Safehold Inc.                            
Schedule of Equity Method Investments [Line Items]                            
Equity interest   66.00%             66.00%   66.00%      
Safehold Inc. | Real estate equity investments                            
Schedule of Equity Method Investments [Line Items]                            
Voting power cap threshold 41.90%                          
Number of director nominees | director 3                          
Independent period 3 years                          
Multifamily Development San Jose                            
Schedule of Equity Method Investments [Line Items]                            
Lessor, operating lease, term of contract (in years)               99 years            
Leasehold improvement allowance, Ground Leases               $ 7,200,000            
Interest income                   800,000 $ 300,000 1,500,000    
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, Washington DC building conversion                            
Schedule of Equity Method Investments [Line Items]                            
Commitment to provide loan to lessee             $ 13,300,000              
Interest income                   $ 300,000   $ 500,000    
Other Real Estate Equity Investment January 2021                            
Schedule of Equity Method Investments [Line Items]                            
Equity interest                         53.00%  
Proceeds from sale of ground lease                           $ 34,000,000.0
Equity method investments                         $ 63,300,000  
Multi-Family Project                            
Schedule of Equity Method Investments [Line Items]                            
Commitment to provide loan to lessee         $ 75,000,000.0                  
Hotel Property                            
Schedule of Equity Method Investments [Line Items]                            
Commitment to provide loan to lessee     $ 50,000,000.0                      
Interest income                 $ 1,500,000   2,400,000      
Amount of loan funded   $ 42,700,000             42,700,000   42,700,000      
Consideration received     $ 1,900,000                      
Ground Lease, Honolulu, Hawaii [Member] | iStar Net Lease II LLC (Net Lease Venture II)                            
Schedule of Equity Method Investments [Line Items]                            
Lessor, operating lease, term of contract (in years)       99 years                    
Land Parcel One | Maximum                            
Schedule of Equity Method Investments [Line Items]                            
Leasehold improvement allowance, Ground Leases   83,000,000.0             83,000,000.0   83,000,000.0      
Land Parcel Two | Maximum                            
Schedule of Equity Method Investments [Line Items]                            
Leasehold improvement allowance, Ground Leases   $ 83,000,000             $ 83,000,000   $ 83,000,000