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Description of the business and summary of significant accounting policies: - IRU Finance Lease Termination - Discount and Gain on Lease Termination (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
M
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
IRU Finance Lease Termination - Discount and Gain on Lease Termination        
Weighted-average discount rate - finance leases   7.60% 8.60% 8.10%
Lease payments   $ 77,362 $ 45,472  
Finance lease liability       $ 538,386
Total principal payments       $ 1,009,096
IRU Finance Lease Agreement        
IRU Finance Lease Termination - Discount and Gain on Lease Termination        
Weighted-average discount rate - finance leases 12.00%      
Lease payments $ 114,600      
Finance lease liability $ 117,900      
Number of monthly installments | M 31      
Lease monthly payments $ 4,200      
Total principal payments 130,200      
Gains on lease terminations $ 3,300