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Other Investments (Narrative) (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Jan. 02, 2019
USD ($)
$ / shares
shares
Nov. 30, 2020
USD ($)
shares
Oct. 31, 2020
USD ($)
Jun. 30, 2020
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
building
lease
Nov. 30, 2019
USD ($)
shares
Aug. 31, 2019
USD ($)
shares
May 31, 2019
USD ($)
Apr. 30, 2019
USD ($)
Feb. 28, 2019
Dec. 31, 2018
USD ($)
lease
building
Jun. 30, 2018
USD ($)
lease
facility
May 31, 2018
USD ($)
office_building
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
building
Dec. 31, 2018
USD ($)
Sep. 30, 2020
USD ($)
Oct. 31, 2019
USD ($)
Jan. 31, 2019
USD ($)
Oct. 31, 2017
USD ($)
Aug. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
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                                                
Payments to acquire equity method investments $ 250,000,000.0                               $ 260,121,000 $ 656,720,000 $ 94,578,000            
Conversion of Investor Units into shares                 1                                
Restriction period on common stock received as payment                                 2 years                
Commitment to extend credit           $ 150,000,000.0                       150,000,000.0              
Number of industrial facilities sold | facility                         2                        
Number of ground leases structured and entered into | lease                         2                        
Number of ground leases sold | lease                         2                        
Net proceeds from sales of real estate                         $ 36,100,000                        
Income from sales of real estate                         $ 24,500,000       $ 6,318,000 236,623,000 126,004,000            
Revenue                                 530,949,000 $ 479,496,000 798,122,000            
Number of units in real estate property to be built | building           3                       3              
Acquisitions of real estate assets                 $ 56,700,000               0 $ 240,487,000 19,454,000            
SAFE                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Expense reimbursements from related party                             $ 700,000   5,000,000.0 2,100,000              
Ground lease term               99 years     98 years                            
Percentage of ownership                                         50.00%        
Great Oaks                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Lease term                                             99 years    
Real estate leasehold improvement allowances                                             $ 7,200,000    
Ground Lease Multifamily Development SanJose CA                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Interest income                                 3,400,000 1,200,000 200,000            
Proceeds from sale of ground lease                                       $ 34,000,000.0          
Gain (loss) from sale of ground lease                                 6,100,000                
Ground Lease, 100 200 Glenridge Point                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Interest income                                   1,900,000              
Ground Lease Conversion Washington DC                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Commitment to extend credit                                           $ 13,300,000      
Interest income                                 1,000,000.0 $ 1,000,000.0              
Ground Lease Conversion Seattle WA                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Commitment to extend credit     $ 22,500,000                                            
Interest income                                 $ 300,000                
Consideration received     $ 2,300,000                                            
Ground Lease Tenant Acquisition                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Commitment to extend credit                                         $ 22,000,000.0        
Net Lease Venture II                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Equity interest                                 51.90%                
Other real estate equity investments                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Equity investments related to party           $ 500,000                                      
Other Real Estate Equity Investment Aug 2018                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Equity interest           50.00%                     50.00% 50.00%              
Interest income                                 $ 2,400,000 $ 2,800,000 1,100,000            
Payments for funding under loan commitments           $ 33,000,000.0                     33,000,000.0 $ 33,000,000.0              
Other Real Estate Equity Investment Dec 2016                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Equity interest           50.00%                       50.00%              
Affiliated Entity                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Real estate transaction price                                   $ 34,300,000              
Payments to acquire land and develop asset                                   7,300,000              
Assumption of loan in acquisition transaction                                   27,000,000.0              
The Properties - Livermore CA | Net Lease Venture II                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Number of properties | building           2           4                          
Acquisitions of real estate assets           $ 81,800,000           $ 31,200,000                          
Percentage of acquired properties leased           100.00%           100.00%                          
Number of leases | lease           2           4                          
Land | Other real estate equity investments                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Carrying value           $ 42,900,000                     31,200,000 42,900,000              
Operating Properties                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Income from sales of real estate                                 200,000 11,900,000 81,000,000.0            
Operating Properties | Other real estate equity investments                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Carrying value           $ 61,700,000                     58,700,000 61,700,000              
Operating Properties | Other Real Estate Equity Investment Dec 2016                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Equity interest                                                 50.00%
Interest income                                   $ 600,000 2,100,000            
Loans commitment                                                 $ 27,000,000.0
Operating Properties | Affiliated Entity | Other Real Estate Equity Investment Dec 2016                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Real estate transaction price                   $ 34,300,000                              
Payments to acquire land and develop asset                   7,300,000                              
Assumption of loan in acquisition transaction                   $ 27,000,000.0                              
Leasehold First Mortgage | Great Oaks                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Commitment to extend credit                                             80,500,000    
Loans receivable net of deferred income                                             $ 80,500,000    
Safehold Inc.                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Ground lease term       99 years                           98 years              
Safehold Inc. | Ground Lease, Atlanta medical office                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Interest income                                   $ 1,200,000 1,400,000            
Safehold Inc. | Ground Lease, 100 200 Glenridge Point                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Commitment to extend credit                           $ 19,900,000                      
Interest income                                     1,400,000            
Number of office buildings | office_building                           2                      
Safehold Inc. | Ground Lease, Atlanta medical office                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Commitment to extend credit                                               $ 24,000,000.0  
Commitment to extend credit, amount funded                                 61,800,000             $ 18,400,000  
Management Fees | SAFE                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Revenue from related party                             $ 1,800,000 $ 1,800,000 12,700,000 7,500,000              
Management Fees | Other Income | Net Lease Venture II                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Commitment to extend credit, amount funded                                 85,900,000                
Revenue                                 $ 1,500,000 $ 1,500,000 $ 400,000            
Management Fees | Master Lease | Other Income | Net Lease Venture II                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Lease term           25 years                       25 years              
Minimum | Other real estate equity investments                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Equity interest                                 31.00%                
Maximum | Other real estate equity investments                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Equity interest                                 95.00%                
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                
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                
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                
Real Estate Investment | SAFE                                                  
Schedule of Equity Method Investments [Line Items]                                                  
Voting power cap threshold 41.90%                                                
Independent period 3 years                                                
Standstill provisions 2 years                                                
Stock transfer limitation maximum per agreement, other than widely distributed public offering 20.00%                                                
Common stock company acquired (in shares)   $ 65,000,000.0     $ 80,000,000.0   $ 130,000,000.0 $ 168,000,000.0                                  
Common stock company acquired | shares   1,100,000     1,700,000   3,800,000 6,000,000.0                                  
Equity interest                                 65.40%