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Description of the business and summary of significant accounting policies: - Change in estimated useful life - owned fiber (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Property and equipment:      
Net (loss) income $ (182,174) $ (204,074) $ 1,273,441
Earning per share - Basic $ (3.8) $ (4.28) $ 26.88
Earning per share - Diluted $ (3.8) $ (4.28) $ 26.62
Owned Fiber [Member]      
Property and equipment:      
Estimated useful lives (in years)   14 years  
Owned Fiber [Member] | Service Life [Member]      
Property and equipment:      
Estimated useful lives (in years)   40 years  
Depreciation expenses   $ 8,700  
Net (loss) income   $ 6,500  
Earning per share - Basic   $ 0.14  
Earning per share - Diluted   $ 0.14