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Real Estate (Dispositions) (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Apr. 30, 2017
USD ($)
lease
property
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
lease
Sep. 30, 2018
USD ($)
lease
Sep. 30, 2017
USD ($)
lease
Dec. 31, 2017
USD ($)
Jan. 01, 2018
USD ($)
Mar. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Number of ground net leases | lease         1 1      
Number of master leases | lease       2          
Net proceeds from sales of real estate $ 36,100,000       $ 271,358,000 $ 201,939,000      
Payments to acquire equity method investments         68,666,000 181,279,000      
Income from sales of real estate $ 24,500,000   $ 5,409,000 [1] $ 19,313,000 [1] 79,353,000 [1] $ 28,267,000 [1]      
Retained deficit     $ (2,350,438,000)   $ (2,350,438,000)   $ (2,470,564,000)    
Accounting Standards Update 2017-05                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Retained deficit               $ (2,394,695,000)  
2017 Secured Financing                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Debt instrument, face amount                 $ 227,000,000.0
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              
Income from sales of real estate   $ 123,400,000              
Ground Net Lease Business | Accounting Standards Update 2017-05 | New Accounting Pronouncement, Early Adoption, Effect                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Gain on sale of business             $ 178,900,000    
Ground Net Lease Business | Safety, Income and Growth, Inc.                  
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              
Payments to acquire equity method investments   $ 55,500,000              
[1] Income from sales of real estate represents gains from sales of real estate that do not qualify as discontinued operations