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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2023
Fair Value of Financial Instruments |
Estimated Fair Value And Carrying Amounts | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Categorization | ​ | As of March 31, 2023 | ​ | As of December 31, 2022
​ | ​ | under the fair value | ​ | Estimated Fair | ​ | ​ | ​ | ​ | Estimated Fair | ​ | ​ | ​
​ |  | hierarchy |  | Value |  | Carrying Value |  | Value |  | Carrying Value
Global revolving credit facilities (1) |  | Level 2 | ​ | $ | 2,531,056 | ​ | $ | 2,531,056 | ​ | $ | 2,167,889 | ​ | $ | 2,167,889
Unsecured term loans (1) |  | Level 2 | ​ | ​ | 1,552,925 | ​ | ​ | 1,552,925 | ​ | ​ | 802,875 | ​ | ​ | 802,875
Unsecured senior notes (2) |  | Level 2 | ​ | ​ | 11,524,720 | ​ | ​ | 13,357,299 | ​ |  | 11,331,989 | ​ |  | 13,220,961
Secured and other debt (2) |  | Level 2 | ​ | ​ | 551,386 | ​ | ​ | 563,856 | ​ |  | 517,226 | ​ |  | 532,130
​ | ​ | ​ | ​ | $ | 16,160,087 | ​ | $ | 18,005,136 | ​ | $ | 14,819,979 | ​ | $ | 16,723,855
(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 and other debt are determined based on the expected future payments discounted at risk-adjusted rates and quoted market prices.

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