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Income taxes - Schedule of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Deferred tax assets: |  |
Fixed assets | $ 4,474 | $ 0
Accrued compensation costs | 13,167 | 12,900
Accrued liabilities | 17,787 | 14,676
Disallowed interest | 121,110 | 115,030
Goodwill | 162 | 3,200
Capitalized research and development costs | 11,572 | 9,743
Partnership investments | 4,961 | 4,231
Loss carryforwards | 203,602 | 224,505
Lease liabilities | 50,826 | 58,828
Other | 15,130 | 17,257
Total deferred tax assets | 442,791 | 460,370
Less: Valuation allowances | (304,673) | (312,038)
Total net deferred tax assets | 138,118 | 148,332
Deferred tax liabilities: |  |
Fixed assets | 0 | (5,565)
Right of use asset | (43,157) | (60,384)
Convertible debt | (22,472) | (18,441)
Pension and other postretirement benefit obligations | (9,380) | (8,388)
Definite and indefinite lived intangible assets | (7,054) | (20,457)
Total deferred tax liabilities | (82,063) | (113,235)
Net deferred tax assets | $ 56,055 | $ 35,097

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