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Debt (Tables)
 3 Months Ended
Mar. 31, 2026
Debt Instruments [Abstract]  
Debt Outstanding and Debt Activity Tables The following table presents the outstanding debt:
March 31, 2026December 31, 2025
thousandsPrincipalCarrying
Value
Fair
Value (1)
PrincipalCarrying
Value
Fair
Value (1)
Short-term debt
Senior Notes$440,505 $440,356 $440,505 $440,505 $440,205 $440,923 
Finance lease liabilities5,247 5,247 5,247 8,620 8,620 8,620 
Total short-term debt
$445,752 $445,603 $445,752 $449,125 $448,825 $449,543 
 
Long-term debt
Senior Notes (2)
$8,236,329 $8,183,025 $7,898,546 $8,236,329 $8,182,745 $8,010,240 
Finance lease liabilities11,146 11,146 11,146 12,425 12,425 12,425 
Total long-term debt
$8,247,475 $8,194,171 $7,909,692 $8,248,754 $8,195,170 $8,022,665 
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(1)Fair value is measured using the market approach and Level 2 fair-value inputs.
(2)As of March 31, 2026, maturity dates range from 2028 to 2050.

Debt activity. The following table summarizes the debt activity for the period presented:
thousandsCarrying Value
Balance at December 31, 2025$8,643,995 
Finance lease liabilities(4,652)
Other431 
Balance at March 31, 2026$8,639,774