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Description of the business: - Lessor Accounting and Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Cash paid for amounts included in the measurement of lease liabilities          
Amortization of right-of-use assets $ 13,331 $ 11,229 $ 41,222 $ 34,997  
Interest expense on finance lease liabilities 11,858 9,633 35,473 29,963  
Operating lease cost 18,502 28,351 54,515 75,318  
Total lease costs $ 43,691 $ 49,213 131,210 140,278  
Operating cash flows from finance leases     (34,079) (19,690)  
Operating cash flows from operating leases     (55,247) (77,571)  
Financing cash flows from finance leases     (25,314) (161,229)  
Right-of-use assets obtained in exchange for new finance lease liabilities     107,665 171,638  
Right-of-use assets obtained in exchange for new operating lease liabilities     $ 17,496 $ 10,547  
Weighted-average remaining lease term - finance leases (in years) 16 years 9 months 18 days 16 years 9 months 18 days 16 years 9 months 18 days 16 years 9 months 18 days  
Weighted-average remaining lease term - operating leases (in years) 11 years 2 months 12 days 11 years 11 years 2 months 12 days 11 years  
Weighted-average discount rate - finance leases 8.40% 8.20% 8.40% 8.20%  
Weighted-average discount rate - operating leases 7.80% 7.90% 7.80% 7.90%  
Finance leases-fiber lease agreements          
Initial terms (in years) 20 years   20 years    
Additional finance lease future payments due $ 160,200   $ 160,200    
Future minimum payments under these operating lease agreements          
2026 63,166   63,166    
2027 60,433   60,433    
2028 56,853   56,853    
2029 52,666   52,666    
2030 29,922   29,922    
Thereafter 235,233   235,233    
Total minimum lease obligations 498,273   498,273    
Less-amounts representing interest (164,385)   (164,385)    
Present value of minimum lease obligations 333,888   333,888    
Current maturities (55,127)   (55,127)   $ (57,172)
Lease obligations, net of current maturities 278,761   278,761   302,004
Future minimum payments under these finance lease agreements          
2026 67,962   67,962    
2027 64,610   64,610    
2028 65,904   65,904    
2029 63,797   63,797    
2030 64,834   64,834    
Thereafter 797,624   797,624    
Total minimum lease obligations 1,124,731   1,124,731    
Less-amounts representing interest (522,890)   (522,890)    
Present value of minimum lease obligations 601,841   601,841    
Current maturities (24,990)   (24,990)   (21,225)
Lease obligations, net of current maturities $ 576,851   $ 576,851   $ 517,161
Minimum          
Finance leases-fiber lease agreements          
Initial terms (in years) 15 years   15 years    
Future minimum payments under these operating lease agreements          
Right to use specified fibers (in years) 20 years   20 years    
Maximum          
Finance leases-fiber lease agreements          
Initial terms (in years) 20 years   20 years    
Future minimum payments under these operating lease agreements          
Right to use specified fibers (in years) 25 years   25 years