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Debt and Interest Expense (Tables)
 6 Months Ended
Jun. 30, 2023
Debt Instruments [Abstract]  
Debt Outstanding and Debt Activity Tables The following table presents the outstanding debt:
 June 30, 2023December 31, 2022
thousandsPrincipalCarrying
Value
Fair
Value (1)
PrincipalCarrying
Value
Fair
Value (1)
Short-term debt
Floating-Rate Senior Notes due 2023
$— $— $— $213,138 $213,121 $214,823 
Finance lease liabilities2,532 2,532 2,532 2,659 2,659 2,659 
Total short-term debt
$2,532 $2,532 $2,532 $215,797 $215,780 $217,482 
Long-term debt
3.100% Senior Notes due 2025
$677,859 $675,888 $648,908 $730,706 $727,953 $692,491 
3.950% Senior Notes due 2025
399,163 397,288 383,780 399,163 396,825 379,107 
4.650% Senior Notes due 2026
468,970 467,186 451,768 474,242 472,161 452,201 
4.500% Senior Notes due 2028
397,182 394,188 375,297 400,000 396,698 368,346 
4.750% Senior Notes due 2028
382,888 380,541 364,054 400,000 397,340 368,141 
4.050% Senior Notes due 2030
1,160,471 1,152,608 1,045,828 1,200,000 1,191,345 1,053,038 
6.150% Senior Notes due 2033
750,000 741,039 755,873 — — — 
5.450% Senior Notes due 2044
600,000 593,954 511,260 600,000 593,878 503,742 
5.300% Senior Notes due 2048
700,000 687,613 587,440 700,000 687,494 580,570 
5.500% Senior Notes due 2048
350,000 342,847 294,126 350,000 342,783 291,194 
5.250% Senior Notes due 2050
1,000,000 984,069 833,880 1,000,000 983,945 829,804 
RCF— — — 375,000 375,000 375,000 
Finance lease liabilities6,993 6,993 6,993 4,160 4,160 4,160 
Total long-term debt
$6,893,526 $6,824,214 $6,259,207 $6,633,271 $6,569,582 $5,897,794 
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(1)Fair value is measured using the market approach and Level-2 fair value inputs.

Debt activity. The following table presents the debt activity for the six months ended June 30, 2023:
thousandsCarrying Value
Balance at December 31, 2022$6,785,362 
RCF borrowings220,000 
Repayments of RCF borrowings(595,000)
Issuance of 6.150% Senior Notes due 2033
750,000 
Repayment of Floating-Rate Senior Notes due 2023(213,138)
Repayment of 3.100% Senior Notes due 2025
(52,847)
Repayment of 4.650% Senior Notes due 2026
(5,272)
Repayment of 4.500% Senior Notes due 2028
(2,818)
Repayment of 4.750% Senior Notes due 2028
(17,112)
Repayment of 4.050% Senior Notes due 2030
(39,529)
Finance lease liabilities2,706 
Other(5,606)
Balance at June 30, 2023$6,826,746 
Interest Expense Table The following table summarizes the amounts included in interest expense:
 Three Months Ended 
June 30,		Six Months Ended 
June 30,
thousands2023202220232022
Long-term and short-term debt
$(85,088)$(78,577)$(166,239)$(162,005)
Finance lease liabilities(230)(31)(393)(73)
Commitment fees and amortization of debt-related costs(3,414)(3,068)(6,295)(6,100)
Capitalized interest 2,550 904 5,075 1,951 
Interest expense$(86,182)$(80,772)$(167,852)$(166,227)