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Property Dispositions, Discontinued Operations and Real Estate Impairment - Additional Information (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) Property | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) Property | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Property | Jun. 30, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Real estate, at cost | $ 31,312,000 |  | $ 31,312,000 |  | $ 16,590,000 |
Mortgage loan related to property sales |  |  | 242,269,000 | $ 55,000,000 |  |
Debt satisfaction gains (charges), net | $ 2,538,000 | $ (398,000) | (818,000) | 13,753,000 |  |
Impairment of real estate |  |  | 69,353,000 | 34,070,000 |  |
Other asset impairment charges |  |  | 6,551,000 |  |  |
Mortgages [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Debt extinguishment amount |  |  | 14,118,000 | 30,293,000 |  |
Transferred Property [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Debt satisfaction gains (charges), net |  |  | (381,000) | 10,106,000 |  |
Sold Properties [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Aggregate gross disposition price |  |  |  | 217,675,000 |  |
Gain on sale of properties |  |  | 58,413,000 | $ 24,884,000 |  |
Office Building [Member] | Transferred Property [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Aggregate gross disposition price |  |  | 561,817,000 |  |  |
Discontinued Operations, Disposed of by Means Other than Sale [Member] | Retail Site [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Real estate, at cost |  |  |  |  |  | $ 0
New York, New York [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Impairment of real estate |  |  | $ 65,500,000 |  |  |
Number of real estate properties held for sale | Property | 3 |  | 3 |  | 2 |
Lease term (in years) |  |  | 99 years |  |  |
Deferred rent receivables, written off |  |  | $ 91,213,000 |  |  |

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