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Real Estate (Dispositions) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 14, 2017
USD ($)
Apr. 30, 2017
USD ($)
lease
property
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net proceeds from sales of real estate     $ 48,469,000 $ 30,215,000    
Payments to acquire equity method investments     43,391,000 1,813,000    
Income from sales of real estate [1]     17,048,000 8,110,000    
Retained earnings (deficit)     $ (2,368,162,000)   $ (2,470,564,000)  
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        
Income from sales of real estate   $ 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]            
Debt instrument, face amount       $ 227,000,000.0    
Accounting Standards Update 2017-05            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Retained earnings (deficit)           $ (2,394,695,000)
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]            
Retained earnings (deficit)           $ 55,500,000
Accounting Standards Update 2017-05 | New Accounting Pronouncement, Early Adoption, Effect | Ground Net Lease Business            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain on sale of business         $ 178,900,000  
[1] Income from sales of real estate represents gains from sales of real estate that do not qualify as discontinued operations