| Assets and Liabilities Measured at Fair Value on a Recurring Basis |
The following table presents our financial assets and financial liabilities that are measured at fair value on a recurring basis and their classification under the fair value hierarchy: | | | | | | | | | | | | | | | | | | | Fair Value Hierarchy | | March 31, 2024 | | December 31, 2023 | | Assets: | | | | | | Money market funds | Level I | | $ | 39,906 | | | $ | 49,541 | | | | | | | | | | | | | | | Interest rate swap contracts | Level II | | 126,788 | | | 112,914 | | | Liabilities: | | | | | | | | | | | | | | | | | | | Contingent consideration related to acquisition | Level III | | 2,303 | | | 2,037 | |
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| Schedule of Carrying Values and Estimated Fair Values of Debt Instruments |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | March 31, 2024 | | December 31, 2023 | | Fair Value Hierarchy | | Carrying Amount (a) | | Estimated Fair Value | | Carrying Amount (a) | | Estimated Fair Value | | | | | | | | | | | | Credit facility debt | Level II | | $ | 6,982,840 | | | $ | 7,042,423 | | | $ | 8,257,682 | | | $ | 8,323,654 | | | | | | | | | | | | | Senior guaranteed notes and senior secured notes | Level II | | 11,112,821 | | | 9,428,313 | | | 9,079,882 | | | 7,784,288 | | | Senior notes | Level II | | 6,590,110 | | | 3,653,838 | | | 7,334,447 | | | 4,932,931 | | | Notes payable and supply chain financing | Level II | | 174,798 | | | 174,798 | | | 174,594 | | | 174,594 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | 24,860,569 | | | $ | 20,299,372 | | | $ | 24,846,605 | | | $ | 21,215,467 | | (a)Amounts are net of unamortized deferred financing costs and discounts/premiums.
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