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Revenue - Narrative (Details) $ in Thousands, people in Millions, customer in Millions		1 Months Ended
	Oct. 28, 2022 USD ($) customer term	Oct. 31, 2021 USD ($)	Sep. 30, 2021 USD ($) people	Feb. 28, 2021 USD ($) people	Dec. 31, 2020 USD ($) people	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2014 USD ($)
Disaggregation of Revenue [Line Items]
Number of people covered by network | people				3.6	7.5
Lease term					30 years
Lease extension			10 years		10 years
Scheduled prepayments					$ 47,700
Contractual term					30 years	30 years
Days after agreement execution, payments due			30 days
Prepayments received						$ 60,759		$ 54,678	$ 2,983
Prepaid expenses and other current assets						16,277		$ 10,147
Spectrum revenue
Disaggregation of Revenue [Line Items]
Prepaid expenses and other current assets										$ 7,500
Ameren
Disaggregation of Revenue [Line Items]
Lease payments received		$ 17,200	$ 5,400	$ 300
Evergy
Disaggregation of Revenue [Line Items]
Number of people covered by network | people			3.9
Lease term			20 years
Scheduled prepayments			$ 30,200
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Disaggregation of Revenue [Line Items]
Agreement term	20 years
Number of agreement extensions | term	2
Agreement extension term	10 years
Total scheduled prepayments	$ 80,000
Prepayments received						$ 8,000	$ 8,000
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Electricity
Disaggregation of Revenue [Line Items]
Number of customers | customer	3.7
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Natural Gas
Disaggregation of Revenue [Line Items]
Number of customers | customer	2.1
Maximum
Disaggregation of Revenue [Line Items]
Lease extension						10 years
Contractual term						10 years

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