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Fair Values of Financial Instruments
 9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Fair Values of Financial Instruments Fair Values of Financial Instruments
The carrying values of cash, cash equivalents and restricted cash, trade receivables and accounts payable approximate fair value due to the short-term maturity of these items. These fair value estimates are considered Level 1 fair value estimates in the fair value hierarchy of fair value accounting.
The estimated fair value of our outstanding debt balances as of September 30, 2025 and December 31, 2024 is set forth below (in thousands):
September 30, 2025December 31, 2024
Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
3.95% Senior Notes Due 2028
$482,505 $471,770 $482,505 $461,720 
5.15% Senior Notes Due 2029
344,895 346,020 344,895 336,490 
7.15% Senior Notes Due 2033
400,000 424,052 400,000 419,265 
Equipment Loans Due 2025— — 6,395 6,424 
Total debt$1,227,400 $1,241,842 $1,233,795 $1,223,899 
The fair values of the 2028 Notes, the 2029 Notes and the 2033 Notes at September 30, 2025 and December 31, 2024 are based on quoted market prices, which are considered Level 1 fair value estimates in the fair value hierarchy of fair value accounting.
The quoted market rates of interest used to determine the fair value of our outstanding debt balances as of September 30, 2025 and December 31, 2024 are set forth below:
September 30, 2025December 31, 2024
3.95% Senior Notes Due 2028
4.97 %5.49 %
5.15% Senior Notes Due 2029
5.06 %5.73 %
7.15% Senior Notes Due 2033
6.18 %6.42 %
Equipment Loans Due 2025— %5.28 %