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Fair Values of Financial Instruments
 6 Months Ended
Jun. 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 June 30, 2025 and December 31, 2024 is set forth below (in thousands):
June 30, 2025December 31, 2024
Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
3.95% Senior Notes Due 2028
$482,505 $467,706 $482,505 $461,720 
5.15% Senior Notes Due 2029
344,895 340,174 344,895 336,490 
7.15% Senior Notes Due 2033
400,000 411,226 400,000 419,265 
Equipment Loans Due 2025— — 6,395 6,424 
Total debt$1,227,400 $1,219,106 $1,233,795 $1,223,899 
The fair values of the 2028 Notes, the 2029 Notes and the 2033 Notes at June 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 fair value of the secured equipment financing term loans (“Equipment Loans”) was based on a 5.25% stated rate of interest, which was considered a Level 2 fair value estimate in the fair value hierarchy of fair value accounting. The Equipment Loans were paid off in full during the three months ended June 30, 2025.
The implied market rates of interest used to determine the fair value of our outstanding debt balances as of June 30, 2025 and December 31, 2024 are set forth below:
June 30, 2025December 31, 2024
3.95% Senior Notes Due 2028
5.24 %5.49 %
5.15% Senior Notes Due 2029
5.51 %5.73 %
7.15% Senior Notes Due 2033
6.70 %6.42 %
Equipment Loans Due 2025— %5.28 %