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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2022
Fair Value of Financial Instruments |
Estimated Fair Value And Carrying Amounts | We calculate the fair value of our secured and other debt and unsecured senior notes based on currently available market rates assuming the loans are outstanding through maturity and considering the collateral and other loan terms. In determining the current market rate for fixed rate debt, a market spread is added to the quoted yields on federal government treasury securities with similar maturity dates to our debt. ​ The aggregate estimated fair value and carrying value of our global revolving credit facilities, unsecured senior notes and secured and other debt as of the respective periods is shown below (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Categorization | ​ | As of March 31, 2022 | ​ | As of December 31, 2021
​ | ​ | under the fair value | ​ | Estimated Fair | ​ | ​ | ​ | ​ | Estimated Fair | ​ | ​ | ​
​ |  | hierarchy |  | Value |  | Carrying Value |  | Value |  | Carrying Value
Global revolving credit facilities |  | Level 2 | ​ | $ | 959,713 | ​ | $ | 959,713 | ​ | $ | 415,116 | ​ | $ | 415,116
Unsecured senior notes (1) |  | Level 2 | ​ |  | 12,880,195 | ​ |  | 13,388,665 | ​ |  | 13,580,262 | ​ |  | 13,000,042
Secured and other debt (1) |  | Level 2 | ​ |  | 158,566 | ​ |  | 160,593 | ​ |  | 152,511 | ​ |  | 147,082
​ | ​ | ​ | ​ | $ | 13,998,474 | ​ | $ | 14,508,971 | ​ | $ | 14,147,889 | ​ | $ | 13,562,240
(1) | Valuations for our unsecured senior notes and secured and other debt are determined based on the expected future payments discounted at risk-adjusted rates and quoted market prices.

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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=123594938&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=123874694&loc=d3e19207-110258 + Details
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