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Pensions and other postretirement benefit plans - Schedule of Multiemployer Pension Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	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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- Definition

Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480547/715-80-55-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 80
-Name Accounting Standards Codification
-Section 35
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480606/715-80-35-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 80
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480576/715-80-50-11

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 80
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480576/715-80-50-9

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