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Description of the business and summary of significant accounting policies: - Lessor Accounting and Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash paid for amounts included in the measurement of lease liabilities      
Amortization of right-of-use assets $ 54,712 $ 48,370 $ 64,698
Interest expense on finance lease liabilities 48,016 40,352 34,940
Operating lease cost 73,574 98,521 92,763
Total lease costs 176,302 187,243 192,401
Operating cash flows from finance leases (46,989) (37,829) (33,080)
Operating cash flows from operating leases (74,655) (102,649) (93,924)
Financing cash flows from finance leases (33,843) (189,208) (77,362)
Right-of-use assets obtained in exchange for new finance lease liabilities 149,058 241,193 232,468
Right-of-use assets obtained in exchange for new operating lease liabilities $ 18,597 $ 12,614 $ 13,682
Weighted-average remaining lease term - finance leases (in years) 16 years 9 months 18 days 17 years 1 month 6 days 11 years 6 months
Weighted-average remaining lease term - operating leases (in years) 11 years 3 months 18 days 10 years 10 months 24 days 12 years 2 months 12 days
Weighted-average discount rate - finance leases 8.40% 8.10% 7.60%
Weighted-average discount rate - operating leases 7.60% 7.80% 8.10%
Finance leases-fiber lease agreements      
Initial terms (in years) 20 years    
Additional finance lease future payments due $ 113,800    
Future minimum payments under these operating lease agreements      
2026 62,137    
2027 58,180    
2028 55,856    
2029 46,584    
2030 28,685    
Thereafter 230,238    
Total minimum lease obligations 481,680    
Less-amounts representing interest (157,351)    
Present value of minimum lease obligations 324,329    
Current maturities (54,576) $ (57,172)  
Lease obligations, net of current maturities 269,753 302,004  
Future minimum payments under these finance lease agreements      
2026 71,002    
2027 67,618    
2028 66,719    
2029 65,938    
2030 65,629    
Thereafter 822,174    
Total minimum lease obligations 1,159,080    
Less-amounts representing interest (535,729)    
Present value of minimum lease obligations 623,351    
Current maturities (26,112) (21,225)  
Lease obligations, net of current maturities $ 597,239 $ 517,161  
Minimum      
Finance leases-fiber lease agreements      
Initial terms (in years) 15 years    
Future minimum payments under these operating lease agreements      
Right to use specified fibers (in years) 20 years    
Maximum      
Finance leases-fiber lease agreements      
Initial terms (in years) 20 years    
Future minimum payments under these operating lease agreements      
Right to use specified fibers (in years) 25 years