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Revenue - Narrative (Details)
$ in Thousands, people in Millions, customer in Millions
 1 Months Ended
Jan. 31, 2024
USD ($)
Nov. 30, 2023
USD ($)
mi²
Oct. 31, 2022
USD ($)
term
customer
Oct. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
renewalOption
people
Feb. 28, 2021
USD ($)
people
Dec. 31, 2020
USD ($)
people
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
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            
Days after agreement execution, payments due         30 days                
Prepayments received               $ 122,212   $ 60,759   $ 54,678  
Prepaid expenses and other current assets               3,912   $ 2,443      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01                          
Disaggregation of Revenue [Line Items]                          
Remaining performance obligation, amount               $ 187,000          
Remaining performance obligation, expected timing of satisfaction, period               30 years          
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     20 years          
Scheduled prepayments         $ 30,200                
Number of renewal options | renewalOption         2                
Xcel Energy | 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               $ 67,100     $ 8,000    
Advance payment received $ 16,800                        
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Electricity                          
Disaggregation of Revenue [Line Items]                          
Number of customers | customer     3.7                    
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Natural Gas                          
Disaggregation of Revenue [Line Items]                          
Number of customers | customer     2.1                    
Tampa Electric Company | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                          
Disaggregation of Revenue [Line Items]                          
Agreement term   20 years                      
Agreement extension term   10 years                      
Total scheduled prepayments   $ 34,500                      
Prepayments received                 $ 6,900        
Service area | mi²   2,000                      
Maximum                          
Disaggregation of Revenue [Line Items]                          
Lease extension               10 years          
Contractual term               10 years          
Maximum | Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                          
Disaggregation of Revenue [Line Items]                          
Prepayments received               $ 65,200