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Mortgages and Other Loans Payable (Details) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) extension debt_instrument | Apr. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jul. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Total fixed rate debt | $ 1,861,696,000 |  | $ 2,400,560,000 |
Total floating rate debt | 677,000,000 |  | 465,431,000 |
Total fixed rate and floating rate debt | 2,538,696,000 |  | 2,865,991,000 |
Mortgages reclassed to liabilities related to assets held for sale | 0 |  | 0 |
Total mortgages and other loans payable | 2,538,696,000 |  | 2,865,991,000 |
Deferred financing costs, net of amortization | (21,599,000) |  | (28,709,000) |
Total mortgages and other loans payable, net | 2,517,097,000 |  | 2,837,282,000 |
Book value of collateral | 3,800,000,000 |  | 4,800,000,000 |
Outstanding under line of credit facility | 351,272,000 |  | 30,336,000 |
Series J Preferred Units |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total fixed rate debt | 0 |  | 4,000,000 |
Unsecured Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total fixed rate debt | $ 0 |  | 16,000,000 |
Uncommitted Master Repurchase Agreements |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of debt instruments | debt_instrument | 2 |  |  |
Uncommitted Master Repurchase Agreement 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total floating rate debt | $ 300,000,000 |  | 90,809,000 |
Term (in Years) | 1 year |  |  |
Maximum facility capacity | $ 300,000,000.0 | $ 400,000,000.0 |  |
Number of extension options | extension | 2 |  |  |
Period of extension options | 1 year |  |  |
Extension option exercised, term | 1 year |  |  |
Outstanding under line of credit facility | $ 299,200,000 |  |  |
Uncommitted Master Repurchase Agreement 2017 | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, floating rate debt (as a percent) | 2.34% |  |  |
Uncommitted Master Repurchase Agreement 2016 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term (in Years) | 2 years |  |  |
Maximum facility capacity |  |  |  | $ 300,000,000.0
Period of extension options | 1 year |  |  |
Basis point fee (as a percent) | 0.25% |  |  |
Threshold amount for basis point fee to be applicable (less than) | $ 150,000,000.0 |  |  |
Uncommitted Master Repurchase Agreement 2016 | Minimum | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, interest rate (as a percent) | 2.25% |  |  |
Uncommitted Master Repurchase Agreement 2016 | Maximum | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, interest rate (as a percent) | 4.00% |  |  |
One Madison Avenue |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total fixed rate debt | $ 469,564,000 |  | 486,153,000 |
One Madison Avenue | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, fixed rate debt (as a percent) | 5.91% |  |  |
762 Madison Avenue |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total fixed rate debt | $ 771,000 |  | 771,000 |
762 Madison Avenue | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, fixed rate debt (as a percent) | 5.00% |  |  |
100 Church Street |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total fixed rate debt | $ 215,223,000 |  | 217,273,000 |
100 Church Street | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, fixed rate debt (as a percent) | 4.68% |  |  |
420 Lexington Avenue |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total fixed rate debt | $ 300,000,000 |  | 300,000,000 |
420 Lexington Avenue | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, fixed rate debt (as a percent) | 3.99% |  |  |
400 East 58th Street |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total fixed rate debt | $ 40,000,000 |  | 40,000,000 |
400 East 58th Street | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, fixed rate debt (as a percent) | 3.00% |  |  |
Term (in Years) | 5 years |  |  |
Landmark Square |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total fixed rate debt | $ 100,000,000 |  | 100,000,000 |
Landmark Square | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, fixed rate debt (as a percent) | 4.90% |  |  |
485 Lexington Avenue |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total fixed rate debt | $ 450,000,000 |  | 450,000,000 |
485 Lexington Avenue | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, fixed rate debt (as a percent) | 4.25% |  |  |
1080 Amsterdam Avenue |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total fixed rate debt | $ 36,138,000 |  | 36,363,000 |
Total fixed rate debt | 35,500,000 |  |  |
Subordinate loan | $ 900,000 |  |  |
1080 Amsterdam Avenue | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, fixed rate debt (as a percent) | 3.58% |  |  |
Term (in Years) | 5 years |  |  |
1080 Amsterdam Avenue | Mortgage loan | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, fixed rate debt (as a percent) | 3.50% |  |  |
1080 Amsterdam Avenue | Subordinate loan | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, fixed rate debt (as a percent) | 7.00% |  |  |
315 West 33rd Street |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total fixed rate debt | $ 250,000,000 |  | 250,000,000 |
315 West 33rd Street | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, fixed rate debt (as a percent) | 4.17% |  |  |
919 Third Avenue |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total fixed rate debt | $ 0 |  | 500,000,000 |
919 Third Avenue | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, fixed rate debt (as a percent) |  |  |  |
719 Seventh Avenue |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total floating rate debt | $ 44,000,000 |  | 41,622,000 |
719 Seventh Avenue | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, floating rate debt (as a percent) | 3.05% |  |  |
183, 187 Broadway & 5-7 Dey Street (7) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total floating rate debt | $ 58,000,000 |  | 58,000,000 |
183, 187 Broadway & 5-7 Dey Street (7) | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, floating rate debt (as a percent) | 2.70% |  |  |
220 East 42nd Street |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total floating rate debt | $ 275,000,000 |  | $ 275,000,000 |
220 East 42nd Street | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, floating rate debt (as a percent) | 1.60% |  |  |

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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