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Subsequent Events (Details)
12 Months Ended
Jan. 02, 2019
USD ($)
multiple
$ / shares
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 27, 2017
$ / shares
Subsequent Event [Line Items]          
Additional cash investment in equity method investment   $ 94,578,000 $ 224,219,000 $ 58,197,000  
Fee percent of SAFE Equity up to $2.5 billion          
Subsequent Event [Line Items]          
Management fee as percent of equity   1.00%      
Fee percent of SAFE Equity up to $2.5 billion | Maximum          
Subsequent Event [Line Items]          
Management fee equity threshold amount   $ 2,500,000,000.0      
Fee percent of SAFE Equity over $2.5 billion          
Subsequent Event [Line Items]          
Management fee as percent of equity   0.75%      
Fee percent of SAFE Equity over $2.5 billion | Minimum          
Subsequent Event [Line Items]          
Management fee equity threshold amount   $ 2,500,000,000.0      
IPO | Safety, Income and Growth, Inc.          
Subsequent Event [Line Items]          
Initial public offering price per share (in dollars per share) | $ / shares         $ 20.00
Subsequent Event          
Subsequent Event [Line Items]          
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        
Subsequent Event | Real Estate Investment | Safety, Income and Growth, Inc.          
Subsequent Event [Line Items]          
Additional cash investment in equity method investment $ 250,000,000        
Number of Investor Units purchased (in shares) | shares 12,500,000        
Investor Units, purchase price per unit (in dollars per share) | $ / shares $ 20.00        
Subsequent Event | Fee percent of SAFE Equity up to $1.5 billion          
Subsequent Event [Line Items]          
Management fee as percent of equity 1.00%        
Subsequent Event | Fee percent of SAFE Equity up to $1.5 billion | Maximum          
Subsequent Event [Line Items]          
Management fee equity threshold amount $ 1,500,000,000.0        
Subsequent Event | Fee percent of SAFE Equity between $1.5 billion and $3.0 billion          
Subsequent Event [Line Items]          
Management fee as percent of equity 1.25%        
Subsequent Event | Fee percent of SAFE Equity between $1.5 billion and $3.0 billion | Minimum          
Subsequent Event [Line Items]          
Management fee equity threshold amount $ 1,500,000,000.0        
Subsequent Event | Fee percent of SAFE Equity between $1.5 billion and $3.0 billion | Maximum          
Subsequent Event [Line Items]          
Management fee equity threshold amount $ 3,000,000,000.0        
Subsequent Event | Fee percent of SAFE Equity between $3.0 billion and $5.0 billion          
Subsequent Event [Line Items]          
Management fee as percent of equity 1.375%        
Subsequent Event | Fee percent of SAFE Equity between $3.0 billion and $5.0 billion | Minimum          
Subsequent Event [Line Items]          
Management fee equity threshold amount $ 3,000,000,000.0        
Subsequent Event | Fee percent of SAFE Equity between $3.0 billion and $5.0 billion | Maximum          
Subsequent Event [Line Items]          
Management fee equity threshold amount $ 5,000,000,000.0        
Subsequent Event | Fee percent of SAFE Equity over $5.0 billion          
Subsequent Event [Line Items]          
Management fee as percent of equity 1.50%        
Subsequent Event | Fee percent of SAFE Equity over $5.0 billion | Minimum          
Subsequent Event [Line Items]          
Management fee equity threshold amount $ 5,000,000,000.0