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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2026
Fair Value Disclosures [Abstract]  
Fair value measurements
TDS has applied the provisions of fair value accounting for purposes of computing the fair value of financial instruments for disclosure purposes as displayed below.
 Level within the Fair Value HierarchyMarch 31, 2026December 31, 2025
 Book ValueFair ValueBook ValueFair Value
(Dollars in thousands)     
Long-term debt2$683,511 $604,482 $834,726 $757,485