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Stock-Based Compensation Plans and Employee Benefits (Performance Incentive Plans) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2022
USD ($)
item
plan
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting rights percentage 15.00%    
Equity-based compensation $ (12,427) $ 5,508  
Performance Incentive Plan      
Accrued expenses $ 115,461   $ 151,810
iPIP Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 6 years    
Vesting rights percentage 40.00%    
Number of iPIP plans | plan 5    
Investment period of iPIP plans 2 years    
Performance Incentive Plan      
Accrued expenses $ 102,400   $ 116,600
2019-2022 Performance Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of ownership classes of consolidated subsidiary | item 2    
Ownership percentage of class A units (as a percent) 100.00%    
Equity-based compensation $ 1,300 1,400  
Settlement or distribution on units and awards, cash (as a percent) 50.00%    
Settlement or distribution on units and awards, common stock (as a percent) 50.00%    
2019-2020 Performance Incentive Plans      
Performance Incentive Plan      
Points at beginning of period (in shares) 95.20    
Granted (in shares) 0    
Forfeited (in shares) 0    
Points at end of period (in shares) 95.20    
Aggregate gross book value of investments $ 764,000,000    
2021-2022 Performance Incentive Plans      
Performance Incentive Plan      
Points at beginning of period (in shares) 92.35    
Granted (in shares) 7.95    
Forfeited (in shares) (0.35)    
Points at end of period (in shares) 84.75    
Aggregate gross book value of investments $ 416,000    
2013-2018 Performance Incentive Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation $ (16,000) 2,400  
Settlement or distribution on units and awards, cash (as a percent) 50.00%    
Settlement or distribution on units and awards, common stock (as a percent) 50.00%    
2013-2014 Performance Incentive Plan      
Performance Incentive Plan      
Points at beginning of period (in shares) 80.17    
Granted (in shares) 0    
Points at end of period (in shares) 80.17    
Aggregate gross book value of investments $ 13,000    
2015-2016 Performance Incentive Plan      
Performance Incentive Plan      
Points at beginning of period (in shares) 70.40    
Granted (in shares) 0    
Points at end of period (in shares) 70.40    
Aggregate gross book value of investments $ 0    
iPIP distributions to plan participants   $ 2,800  
iPIP distributions, equity component (in shares) | shares   86,807  
iPIP distributions, equity component, fair value (in dollars per share) | $ / shares   $ 17.72  
iPIP distributions, shares issued net of tax withholdings (in shares) | shares   51,854  
2017-2018 Performance Incentive Plan      
Performance Incentive Plan      
Points at beginning of period (in shares) 75.34    
Granted (in shares) 0    
Points at end of period (in shares) 75.34    
Aggregate gross book value of investments $ 277,000    
Safehold Inc.      
Performance Incentive Plan      
Number of shares owned (in shares) | shares 40,100,000    
Safehold Inc. | Common Stock | 2019-2020 Performance Incentive Plans      
Performance Incentive Plan      
Number of shares owned (in shares) | shares 26,700,000    
Safehold Inc. | Common Stock | 2021-2022 Performance Incentive Plans      
Performance Incentive Plan      
Number of shares owned (in shares) | shares 5,000,000.0    
Safehold Inc. | Common Stock | 2017-2018 Performance Incentive Plan      
Performance Incentive Plan      
Number of shares owned (in shares) | shares 7,600,000