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Debt - Long-Term Debt (Details) - USD ($) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jan. 31, 2018 | Dec. 31, 2017 | Aug. 31, 2014
Debt Instrument [Line Items] |  |  |  |
Unsecured facility | $ 0 |  | $ 0 |
Deferred financing costs, net | (16,306,000) |  | (17,407,000) |
Total | 609,299,000 |  | 717,164,000 |
Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | 615,537,000 |  | 721,224,000 |
Total principal | 1,930,537,000 |  | 1,701,224,000 |
Unamortized discount, net of unamortized premium | (2,315,000) |  | (3,370,000) |
Deferred financing costs, net | (9,538,000) |  | (9,133,000) |
Total | 1,918,684,000 |  | 1,688,721,000 |
Metro Center | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 92,372,000 |  | 93,948,000 |
Stated rate (as a percent) | 3.59% |  |  |
Effective Rate (as a percentage) | 3.66% |  |  |
10 Union Square | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 50,000,000 |  | 50,000,000 |
Stated rate (as a percent) | 3.70% |  |  |
Effective Rate (as a percentage) | 3.97% |  |  |
1542 Third Avenue | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 30,000,000 |  | 30,000,000 |
Stated rate (as a percent) | 4.29% |  |  |
Effective Rate (as a percentage) | 4.53% |  |  |
First Stamford Place | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 180,000,000 |  | 180,000,000 |
Stated rate (as a percent) | 4.28% |  |  |
Effective Rate (as a percentage) | 4.44% |  |  |
1010 Third Avenue and 77 West 55th Street | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 39,177,000 |  | 39,710,000 |
Stated rate (as a percent) | 4.01% |  |  |
Effective Rate (as a percentage) | 4.20% |  |  |
10 Bank Street | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 33,988,000 |  | 34,602,000 |
Stated rate (as a percent) | 4.23% |  |  |
Effective Rate (as a percentage) | 4.35% |  |  |
383 Main Avenue | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 30,000,000 |  | 30,000,000 |
Stated rate (as a percent) | 4.44% |  |  |
Effective Rate (as a percentage) | 4.55% |  |  |
1333 Broadway | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 160,000,000 |  | 66,602,000 |
Stated rate (as a percent) | 4.21% | 4.21% |  |
Effective Rate (as a percentage) | 4.26% |  |  |
Face amount |  | $ 160,000,000.0 |  |
1400 Broadway (first lien mortgage loan) | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 0 |  | 66,632,000 |
Stated rate (as a percent) | 0.00% |  |  |
Effective Rate (as a percentage) | 0.00% |  |  |
1400 Broadway (second lien mortgage loan) | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 0 |  | 9,172,000 |
Stated rate (as a percent) | 0.00% |  |  |
Effective Rate (as a percentage) | 0.00% |  |  |
111 West 33rd Street (first lien mortgage loan) | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 0 |  | 74,045,000 |
Stated rate (as a percent) | 0.00% |  |  |
Effective Rate (as a percentage) | 0.00% |  |  |
111 West 33rd Street (second lien mortgage loan) | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 0 |  | 9,369,000 |
Stated rate (as a percent) | 0.00% |  |  |
Effective Rate (as a percentage) | 0.00% |  |  |
1350 Broadway | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 0 |  | 37,144,000 |
Stated rate (as a percent) | 0.00% |  |  |
Effective Rate (as a percentage) | 0.00% |  |  |
Senior unsecured notes - exchangeable | Convertible debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt | $ 250,000,000 |  | 250,000,000 |
Stated rate (as a percent) | 2.625% |  |  | 2.625%
Effective Rate (as a percentage) | 3.93% |  |  |
Face amount |  |  |  | $ 250,000,000.0
Senior unsecured notes, Series A | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 100,000,000 |  | 100,000,000 |
Stated rate (as a percent) | 3.93% |  |  |
Effective Rate (as a percentage) | 3.96% |  |  |
Senior unsecured notes, Series B | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 125,000,000 |  | 125,000,000 |
Stated rate (as a percent) | 4.09% |  |  |
Effective Rate (as a percentage) | 4.12% |  |  |
Senior unsecured notes, Series C | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 125,000,000 |  | 125,000,000 |
Stated rate (as a percent) | 4.18% |  |  |
Effective Rate (as a percentage) | 4.21% |  |  |
Senior unsecured notes, Series D | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 115,000,000 |  | $ 115,000,000 |
Stated rate (as a percent) | 4.08% |  | 4.08% |
Effective Rate (as a percentage) | 4.11% |  |  |
Face amount |  |  | $ 115,000,000.0 |
Senior unsecured notes, Series E | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 160,000,000 |  | $ 0 |
Stated rate (as a percent) | 4.26% |  | 4.26% |
Effective Rate (as a percentage) | 4.27% |  |  |
Face amount |  |  | $ 160,000,000.0 |
Senior unsecured notes, Series F | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 175,000,000 |  | $ 0 |
Stated rate (as a percent) | 4.44% |  | 4.44% |
Effective Rate (as a percentage) | 4.45% |  |  |
Face amount |  |  | $ 175,000,000.0 |
Unsecured revolving credit facility | Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured facility | $ 0 |  | 0 |
Effective Rate (as a percentage) | 3.36% |  |  |
Unsecured revolving credit facility | Revolving credit facility | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate (as a percentage) | 1.10% |  |  |
Unsecured term loan facility | Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured facility | $ 265,000,000 |  | $ 265,000,000 |
Stated rate (as a percent) | 3.35% |  |  |
Pay rate (as a percent) | 2.1485% |  |  |
Unsecured term loan facility | Revolving credit facility | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate (as a percentage) | 1.20% |  |  |
First Stamford Place - First Lien | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated rate (as a percent) | 4.09% |  |  |
Face amount | $ 164,000,000 |  |  |
First Stamford Place - Second Lien | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated rate (as a percent) | 6.25% |  |  |
Face amount | $ 16,000,000 |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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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