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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2021
Fair Value Measurements |
Summary of assets and liabilities measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements
​ |  | Total |  | Level 1 |  | Level 2 |  | Level 3
​ | ​ | (In thousands)
March 31, 2021 |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative financial instruments designated as cash flow hedges: | ​ |  |  |  | ​ |  | ​ |  |  |  | ​ |
Classified as liabilities in "Other liabilities, net" | ​ | $ | 34,181 | ​ |  | — | ​ | $ | 34,181 | ​ |  | —
Derivative financial instruments not designated as cash flow hedges: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Classified as assets in "Other assets, net" | ​ |  | 167 | ​ |  | — | ​ |  | 167 | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2020 | ​ |  |  |  | ​ |  | ​ |  |  |  | ​ |
Derivative financial instruments designated as cash flow hedges: | ​ |  |  |  | ​ |  | ​ |  |  |  | ​ |
Classified as liabilities in "Other liabilities, net" | ​ | $ | 44,222 | ​ |  | — | ​ | $ | 44,222 | ​ |  | —
Derivative financial instruments not designated as cash flow hedges: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Classified as assets in "Other assets, net" | ​ |  | 35 | ​ |  | — | ​ |  | 35 | ​ |  | —
Schedule of financial instruments and liabilities were reflected in our balance sheets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021 | ​ | December 31, 2020
​ |  | Carrying |  | ​ |  | Carrying |  | ​
​ | ​ | Amount (1) | ​ | Fair Value | ​ | Amount (1) | ​ | Fair Value
​ |  | (In thousands)
Financial liabilities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Mortgages payable | ​ | $ | 1,601,635 | ​ | $ | 1,614,367 | ​ | $ | 1,603,869 | ​ | $ | 1,606,470
Unsecured term loans | ​ |  | 400,000 | ​ |  | 400,354 | ​ |  | 400,000 | ​ |  | 399,678
(1) | The carrying amount consists of principal only.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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