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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 ($)
M
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Description of the business and summary of significant accounting policies:        
Weighted-average discount rate - finance leases   8.40% 8.10% 7.60%
Lease payments   $ 33,843 $ 74,632 $ 77,362
Finance lease liability   623,351    
Total principal payments   $ 1,159,080    
IRU finance lease termination        
Description of the business and summary of significant accounting policies:        
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