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Pensions and other postretirement benefit plans - Schedule of Multiemployer Pension Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Contributions | $ 1,384 | $ 1,480 | $ 1,815
CWA/ITU Negotiated Pension Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Contributions | 160 | 255 | 276
GCIU—Employer Retirement Benefit Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Contributions | 46 | 41 | 42
The Newspaper Guild International Pension Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Contributions | 9 | 14 | 15
IAM National Pension Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Contributions | 118 | 147 | 177
Teamsters Pension Trust Fund of Philadelphia and Vicinity |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Contributions | 998 | 965 | 1,249
Central Pension Fund of the International Union of Operating Engineers and Participating Employers |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Contributions | $ 53 | $ 58 | $ 56

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