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Real Estate (Disposition of Ground Lease Business) (Details) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 14, 2017 USD ($) | Jun. 30, 2018 USD ($) | Apr. 30, 2017 USD ($) lease property | Jan. 02, 2018 USD ($) | Dec. 31, 2018 USD ($) lease_asset | Dec. 31, 2017 USD ($) lease_asset | Dec. 31, 2016 USD ($) lease_asset property | Jan. 01, 2018 USD ($) | Mar. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of properties | property |  |  |  |  |  |  | 2 |  |
Number of net lease assets | lease_asset |  |  |  |  | 2 | 1 | 1 |  |
Net proceeds from sales of real estate |  | $ 36,100,000 |  |  | $ 411,786,000 | $ 314,013,000 | $ 435,560,000 |  |
Payments to acquire equity method investments |  |  |  |  | 94,578,000 | 224,219,000 | 58,197,000 |  |
Gain on sale of discontinued operation |  |  |  |  | $ 0 | $ 123,418,000 | $ 0 |  |
Increase to retained earnings upon adoption of new accounting standard |  |  |  |  |  |  |  | $ 75,869,000 |
ASU No. 2017-05 |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Increase to retained earnings upon adoption of new accounting standard |  |  |  |  |  |  |  | 55,500,000 |
SAFE |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments | $ 55,500,000 |  | $ 55,500,000 |  |  |  |  |  |
Safety, Income and Growth, Inc. |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of lease assets |  |  | $ 161,100,000 |  |  |  |  |  |
2017 Secured Financing |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument amount |  |  |  |  |  |  |  |  | $ 227,000,000.0
Secured Debt | 2017 Secured Financing |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument amount |  |  |  |  |  |  |  |  | $ 227,000,000.0
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 net lease assets | 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 |  |  |  |  |  |
Gain on sale of discontinued operation |  |  | $ 123,400,000 | $ 178,900,000 |  |  |  |  |
Ground Net Lease Business | ASU No. 2017-05 |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Increase to retained earnings upon adoption of new accounting standard |  |  |  |  |  |  |  | $ 55,500,000 |

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