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Unconditional Purchase Obligations (Tables)
 12 Months Ended
Dec. 31, 2020
Unconditional Purchase Obligations (Excluding Capital Stock Redemptions) [Abstract]  
Unconditional Purchase Obligations Future expenditures under unconditional purchase obligations in effect as of December 31, 2020 are as follows:
(in thousands)
2021$44,865 
202220,751 
20236,758 
20242,525 
202526 
Total$74,925