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Real Estate (Dispositions) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 14, 2017
USD ($)
Apr. 30, 2017
USD ($)
lease
property
Mar. 31, 2017
USD ($)
property
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Net proceeds from sales of real estate           $ 154,291,000 $ 247,956,000
Gain sale of properties [1]       $ 844,000 $ 43,484,000 $ 8,954,000 53,943,000
Noncontrolling interest, ownership percentage by parent       95.70%   95.70%  
Earnings from equity method investments       $ 5,515,000 $ 39,447,000 $ 11,217,000 47,714,000
Residential Condominiums              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain sale of properties           2,700,000 18,800,000
Proceeds from sale of other real estate           17,600,000 59,200,000
Net Lease Asset Two              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain sale of properties           6,200,000 9,200,000
Net proceeds from sales of real estate           19,500,000 30,200,000
Commercial Operating Properties              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain sale of properties             25,900,000
Net proceeds from sales of real estate             $ 158,900,000
Safety, Income and Growth, Inc.              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Carrying value of properties   $ 161,100,000          
Gain sale of properties   $ 123,400,000          
Safety, Income and Growth, Inc. | Ground Net Lease Business              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Number of properties | property   12          
Number of ground net leases | lease   7          
Number of master leases | lease   1          
Number of properties covered under master lease agreement | property   5          
Net proceeds from sales of real estate $ 113,000,000 $ 113,000,000          
Payments to acquire equity method investments $ 55,500,000 $ 55,500,000          
Noncontrolling interest, ownership percentage by parent 51.00%            
2017 Secured Financing              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Number of properties covered under master lease agreement | property     5        
Debt instrument, face amount $ 227,000,000.0   $ 227,000,000.0 $ 227,000,000.0   $ 227,000,000.0  
[1] Income from sales of real estate represents gains from sales of real estate that do not qualify as discontinued operations.