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Income taxes - Temporary differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred Tax Assets:    
Net operating loss carry-forwards $ 236,346 $ 244,306
Interest expense limitation 66,386 34,828
Accrued liabilities and other 8,584 12,055
Operating leases 98,261 107,563
Total gross deferred tax assets 409,577 398,752
Valuation allowance (131,773) (136,533)
Net deferred tax assets 277,804 262,219
Deferred Tax Liabilities:    
Property & equipment 308,254 295,630
Intangibles 113,596 118,727
Deferred consideration - IP Transit Services Agreement 63,070 114,844
Investment in foreign subsidiaries 95,974 100,081
Right-of-use assets 95,176 104,435
Gross deferred tax liabilities 676,070 733,717
Net deferred tax liabilities 398,266 $ 471,498
Sprint Business    
Deferred Tax Liabilities:    
Net deferred tax liabilities $ 475,000