Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Contractual interest rate for funds borrowed, under the debt 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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Debt - Mortgage Debt (Details) - USD ($)	1 Months Ended	12 Months Ended
Debt - Mortgage Debt (Details) - USD ($)	Jan. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2017	May 31, 2017	Apr. 30, 2017
Debt Instrument [Line Items]
Repayments of mortgage loan		$ 346,615,000	$ 32,305,000	$ 146,918,000
Mortgages [Member]
Debt Instrument [Line Items]
Fixed rate debt		$ 721,224,000	752,840,000
Mortgages [Member] \| 1542 Third Avenue [Member]
Debt Instrument [Line Items]
Face amount							$ 30,000,000.0
Stated interest rate		4.29%					4.29%
Fixed rate debt		$ 30,000,000	17,795,000
Mortgages [Member] \| 10 Bank Street [Member]
Debt Instrument [Line Items]
Face amount						$ 35,000,000.0
Stated interest rate		4.23%				4.23%
Fixed rate debt		$ 34,602,000	31,544,000
Mortgages [Member] \| First Stamford Place [Member]
Debt Instrument [Line Items]
Face amount					$ 180,000,000.0
Stated interest rate		4.28%			4.28%
Fixed rate debt		$ 180,000,000	235,067,000
Mortgages [Member] \| First Stamford Place - First Lien [Member]
Debt Instrument [Line Items]
Face amount		$ 164,000,000			$ 164,000,000.0
Stated interest rate		4.09%			4.09%
Mortgages [Member] \| First Stamford Place - Second Lien [Member]
Debt Instrument [Line Items]
Face amount		$ 16,000,000			$ 16,000,000.0
Stated interest rate		6.25%			6.25%
Mortgages [Member] \| 1010 Third Avenue and 77 West 55th Street [Member]
Debt Instrument [Line Items]
Face amount					$ 40,000,000.0
Stated interest rate		4.01%			4.01%
Fixed rate debt		$ 39,710,000	26,502,000
Mortgages [Member] \| 383 Main Avenue [Member]
Debt Instrument [Line Items]
Face amount					$ 30,000,000.0
Stated interest rate		4.44%			4.44%
Fixed rate debt		$ 30,000,000	28,654,000
Mortgages [Member] \| 1333 Broadway [Member]
Debt Instrument [Line Items]
Stated interest rate		6.32%
Fixed rate debt		$ 66,602,000	$ 67,656,000
Subsequent Event [Member] \| Mortgages [Member] \| 1333 Broadway [Member]
Debt Instrument [Line Items]
Face amount	$ 160,000,000
Stated interest rate	4.21%
Subsequent Event [Member] \| Mortgages [Member] \| 1400 Broadway [Member]
Debt Instrument [Line Items]
Repayments of mortgage loan	$ 75,800,000