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Unconditional Purchase Obligations (Tables)
 12 Months Ended
Dec. 31, 2021
Unconditional Purchase Obligations (Excluding Capital Stock Redemptions) [Abstract]  
Unconditional Purchase Obligations Future expenditures under unconditional purchase obligations in effect as of December 31, 2021 are as follows:
(in thousands)
2022$54,788 
202312,858 
20244,671 
20251,759 
20261,119 
Total$75,195