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Fair value measurements (Tables) | 6 Months Ended
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Jun. 30, 2014
Fair Value Measurements [Abstract] |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  |  |  | As of June 30, 2014 |
| (Amounts in thousands) | Total |  | Level 1 |  | Level 2 |  | Level 3 |
|  | Marketable securities | $ | 35,729 |  | $ | 35,729 |  | $ | - |  | $ | - |
|  | Interest rate cap (included in other assets) |  | 47 |  |  | - |  |  | 47 |  |  | - |
|  |  | Total assets | $ | 35,776 |  | $ | 35,729 |  | $ | 47 |  | $ | - |
|  |  |  | As of December 31, 2013 |
| (Amounts in thousands) | Total |  | Level 1 |  | Level 2 |  | Level 3 |
|  | Marketable securities | $ | 31,522 |  | $ | 31,522 |  | $ | - |  | $ | - |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | As of June 30, 2014 |  | As of December 31, 2013
|  | Carrying |  | Fair |  | Carrying |  | Fair
(Amounts in thousands) | Amount |  | Value |  | Amount |  | Value
Assets: |  |  |  |  |  |  |  |  |  |  |
| Cash equivalents | $ | 303,433 |  | $ | 303,433 |  | $ | 184,796 |  | $ | 184,796
Liabilities: |  |  |  |  |  |  |  |  |  |  |
| Mortgages payable | $ | 1,034,289 |  | $ | 1,037,000 |  | $ | 1,049,959 |  | $ | 1,072,000
| Leasing commissions (included in amounts due to Vornado) |  | 41,279 |  |  | 41,000 |  |  | 42,924 |  |  | 43,000
|  | $ | 1,075,568 |  | $ | 1,078,000 |  | $ | 1,092,883 |  | $ | 1,115,000

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + Details
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