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Income taxes - Schedule of Deferred Tax Liabilities and Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
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