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Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended
Feb. 28, 2021
Dec. 31, 2021
Mar. 31, 2021
Acquired Indefinite-lived Intangible Assets [Line Items]      
Initial Deposits   $ 5,900 $ 2,300
Gain (loss) from disposal of intangible assets, net   10,200  
Prepaid expenses and other current assets   7,269 3,508
Other assets   1,675 1,214
Wireless Licenses [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Asset Acquisition, Consideration Transferred   12,100  
Prepaid Expenses and Other Current Assets [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Initial Deposits   5,500 1,900
Other Assets [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Initial Deposits   400 400
New Wireless Licenses [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Estimated fair value   13,600  
Narrowband Licenses [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Amount disposed   3,400  
SDG&E [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Asset Acquisition, Consideration Transferred $ 50,000    
Third Parties [Member] | Wireless Licenses [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Asset Acquisition, Consideration Transferred   10,100  
Anti-Windfall [Member] | Wireless Licenses [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Asset Acquisition, Consideration Transferred   2,000  
In-Process Deals [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Prepaid Expense And Other Assets Current And Noncurrent   800 400
Prepaid expenses and other current assets   100 100
Other assets   $ 700 $ 300