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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.

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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