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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

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