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Fair Value Measurements (Tables) | 3 Months Ended
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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 Hierarchy |  | March 31, 2026 |  | December 31, 2025
| Book Value |  | Fair Value |  | Book Value |  | Fair Value
(Dollars in thousands) |  |  |  |  |  |  |  |  |
Long-term debt | 2 |  | $ | 683,511 |  |  | $ | 604,482 |  |  | $ | 834,726 |  |  | $ | 757,485 |

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