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Real Estate (Dispositions) (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 14, 2017
USD ($)
Apr. 30, 2017
USD ($)
lease
property
Mar. 31, 2017
USD ($)
property
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 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           $ 201,939,000 $ 412,335,000
Payments to acquire equity method investments           181,279,000 45,635,000
Gain sale of properties [1]       $ 19,313,000 $ 34,444,000 28,267,000 88,387,000
Residential Condominiums              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain sale of properties           3,300,000 23,300,000
Proceeds from sale of other real estate           21,800,000 74,900,000
Net Lease Asset Two              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain sale of properties           25,000,000 15,900,000
Net proceeds from sales of real estate           $ 61,700,000 108,500,000
Commercial Operating Properties              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain sale of properties             49,200,000
Net proceeds from sales of real estate             $ 229,100,000
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          
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        
[1] Income from sales of real estate represents gains from sales of real estate that do not qualify as discontinued operations.