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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2022
Fair Value of Financial Instruments |
Estimated Fair Value And Carrying Amounts | The aggregate estimated fair value and carrying value of our global revolving credit facilities, unsecured term loans, unsecured senior notes and secured debt as of the respective periods is shown below (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Categorization | ​ | As of December 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 | ​ | $ | 2,167,889 | ​ | $ | 2,167,889 | ​ | $ | 415,116 | ​ | $ | 415,116
Unsecured term loans (1) |  | Level 2 | ​ | ​ | 802,875 | ​ | ​ | 802,875 | ​ | ​ | — | ​ | ​ | —
Unsecured senior notes (2) |  | Level 2 | ​ | ​ | 11,331,989 | ​ | ​ | 13,220,961 | ​ |  | 13,580,262 | ​ |  | 13,000,042
Secured and other debt (2) |  | Level 2 | ​ | ​ | 517,226 | ​ | ​ | 532,130 | ​ |  | 152,511 | ​ |  | 147,082
​ | ​ | ​ | ​ | $ | 14,819,979 | ​ | $ | 16,723,855 | ​ | $ | 14,147,889 | ​ | $ | 13,562,240
(1) | The carrying value of our unsecured term loans approximates estimated fair value, due to the variability of interest rates and the stability of our credit ratings.
(2) | Valuations for our unsecured senior notes and secured debt are determined based on the expected future payments discounted at risk-adjusted rates and quoted market prices.

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