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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

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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