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FAIR VALUE MEASUREMENTS Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Fair Value of Assets and Liabilities Measured on a Recurring Basis
The following table shows the fair value of our significant financial assets that are required to be measured at fair value on a recurring basis, which are classified on the consolidated balance sheets as cash and cash equivalents.

Estimated Fair Value
September 30, 2023
December 31, 2022
Level 1Level 2TotalLevel 1Level 2Total
(in thousands)
Assets:
Cash equivalents$573,696 $— $573,696 $503,964 $— $503,964 
Interest rate swaps$— $59,291 $59,291 $— $41,515 $41,515 
Estimated Fair Values of Debt
The following table presents the estimated fair values of our senior secured notes, senior notes and convertible senior notes:
Estimated Fair Value at
September 30, 2023December 31, 2022
Level 2
(in thousands)
6.5% Senior Secured Notes due 2027$1,183,812 $1,175,460 
3.75% Senior Secured Notes due 2028$443,305 $429,035 
4.875% Senior Notes due 2024$565,294 $560,027 
5.625% Senior Notes due 2026$288,531 $285,315 
4.75% Senior Notes due 2027$870,856 $847,562 
2.5% Convertible Senior Notes due 2023$— $588,473 
2.0% Convertible Senior Notes due 2025$409,280 $397,536 
3.125% Convertible Senior Notes due 2029$1,039,520 $—