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Income taxes - Schedule of Deferred Tax Liabilities and Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Deferred tax assets:    
Fixed assets $ 5,961 $ 4,474
Accrued compensation costs 9,420 13,167
Accrued liabilities 16,041 17,787
Disallowed interest 124,816 121,110
Goodwill 0 162
Capitalized research and development costs 17,607 11,572
Partnership investments 0 4,961
Loss carryforwards 196,585 203,602
Lease liabilities 43,248 50,826
Definite and indefinite lived intangible assets 7,773 0
Other 25,414 15,130
Total deferred tax assets 446,865 442,791
Less: Valuation allowances (298,033) (304,673)
Total net deferred tax assets 148,832 138,118
Deferred tax liabilities:    
Partnership investments (1,130) 0
Goodwill (825) 0
Right-of-use assets (36,406) (43,157)
Convertible debt (21,218) (22,472)
Pension and other postretirement benefit obligations (19,537) (9,380)
Definite and indefinite lived intangible assets 0 (7,054)
Total deferred tax liabilities (79,116) (82,063)
Net deferred tax assets $ 69,716 $ 56,055