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Unconditional Purchase Obligations (Tables)
 12 Months Ended
Dec. 31, 2023
Unconditional Purchase Obligations (Excluding Capital Stock Redemptions) [Abstract]  
Unconditional Purchase Obligations Future expenditures under unconditional purchase obligations in effect as of December 31, 2023 are as follows:
(in thousands)
2024$66,421 
202527,144 
20269,980 
20277,927 
2028298 
Total$111,770