Area of a communication tower space under lease as per the agreement.

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Network Development Future Expenditures

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Represents the number of business units.

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Represents the number of retail wireless subscribers acquired.

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Represents the number of subscribers of pay tv services.

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Represents the number of wireless subscribers as on the balance sheet date.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the capitalized costs to acquire rights under a license arrangement (for example, to sell specified products in a specified territory) having an indefinite period of benefit.

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Portion of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a VIE that is attributable to the noncontrolling interest (previously referred to as minority interest).

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Organization and Business Activities (Details) $ in Thousands		3 Months Ended	12 Months Ended	156 Months Ended
	Aug. 01, 2020 item	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) item area segment	Dec. 31, 2020 USD ($) item area	Dec. 31, 2019 USD ($)
Spectrum Investments
Number of primary operating business segments \| segment			2
Number of business units \| item			2
Number of Pay-TV subscribers \| item			11,290,000	11,290,000
Number Of wireless subscribers \| item			9,055,000	9,055,000
Payment to acquire certain wireless licenses and related assets				$ 21,000,000
FCC authorizations			$ 26,903,939	26,903,939	$ 25,779,503
Total debt and equity investments in subsidiaries			10,000,000	10,000,000
Non-cash impairment charge		$ 253,000	227,000
Network Development Future Expenditures			10,000,000
Capitalized interest on FCC authorizations [Member]
Spectrum Investments
FCC authorizations			$ 5,560,422	$ 5,560,422	4,638,519
Prepaid Business
Spectrum Investments
Number of retail wireless subscribers acquired \| item			9,000,000
Sling TV Holding L.L.C.
Spectrum Investments
Number of Pay-TV subscribers \| item			2,474,000	2,474,000
Lease Agreement With Crown Castle
Spectrum Investments
Area of Leased Space \| area			20,000	20,000
Ting Mobile
Spectrum Investments
Number of retail wireless subscribers acquired \| item	200,000		200,000
Northstar Spectrum And SNR Holdco
Spectrum Investments
Total debt and equity investments in subsidiaries			$ 10,000,000	$ 10,000,000
Dish TV
Spectrum Investments
Number of Pay-TV subscribers \| item			8,816,000	8,816,000
Wireless
Spectrum Investments
Payment to acquire certain wireless licenses and related assets				$ 11,000,000
FCC authorizations			$ 11,453,128	$ 11,453,128	$ 11,250,595