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The number of years after the grant of a wireless spectrum license until the right to put vests.

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Accounting policy disclosures
Capitalized Contract Cost	$ 37,000	$ 41,000
Amortization expense related to the programs	14,000	3,000
Total costs capitalized	192,000		$ 169,000
Deferred taxes	$ 2,529,065		$ 2,474,907
Revenue, Practical Expedient, Financing Component [true false]	true
Research and Development
Research and development cost	$ 5,000	$ 6,000
Northstar Manager LLC \| Minimum
Variable Interest Entity
Number of years after wireless spectrum license is granted until put right vests	5 years
Northstar Manager LLC \| Maximum
Variable Interest Entity
Number of years after wireless spectrum license is granted until put right vests	6 years
SNR Wireless Management LLC \| Minimum
Variable Interest Entity
Number of years after wireless spectrum license is granted until put right vests	5 years
SNR Wireless Management LLC \| Maximum
Variable Interest Entity
Number of years after wireless spectrum license is granted until put right vests	6 years