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Description of the business and recent developments: Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Finance leases-fiber lease agreements          
Initial terms 22 years   22 years    
Additional finance lease future payments due $ 172,500   $ 172,500    
Cash paid for amounts included in the measurement of lease liabilities          
Amortization of right-of-use assets 7,000 $ 6,378 13,998 $ 12,724  
Interest expense on finance lease liabilities 5,116 4,685 10,197 9,911  
Operating lease cost 4,628 4,671 9,401 9,088  
Total lease costs $ 16,744 $ 15,734 33,596 31,723  
Operating cash flows from finance leases     (11,083) (10,111)  
Operating cash flows from operating leases     (9,543) (10,104)  
Financing cash flows from finance leases     (11,099) (11,936)  
Right-of-use assets obtained in exchange for new finance lease liabilities     23,685 16,218  
Right-of-use assets obtained in exchange for new operating lease liabilities     $ 9,429 $ 12,531  
Weighted-average remaining lease term - finance leases (in years) 12 years 8 months 12 days 12 years 6 months 12 years 8 months 12 days 12 years 6 months  
Weighted-average remaining lease term - operating leases (in years) 18 years 1 month 6 days 19 years 4 months 24 days 18 years 1 month 6 days 19 years 4 months 24 days  
Weighted average discount rate - finance leases 8.70% 9.80% 8.70% 9.80%  
Weighted average discount rate - operating leases 5.40% 5.50% 5.40% 5.50%  
Future minimum payments (principal and interest) under these finance leases          
2022 $ 37,002   $ 37,002    
2023 36,498   36,498    
2024 36,162   36,162    
2025 29,062   29,062    
2026 29,013   29,013    
Thereafter 259,294   259,294    
Total minimum lease obligations 427,031   427,031    
Less-amounts representing interest (172,817)   (172,817)    
Present value of minimum lease obligations 254,214   254,214    
Current maturities (17,562)   (17,562)   $ (17,048)
Finance lease obligations, net of current maturities 236,652   236,652   228,822
Future minimum payments under these operating lease agreements          
2022 18,071   18,071    
2023 18,078   18,078    
2024 16,862   16,862    
2025 14,332   14,332    
2026 12,551   12,551    
Thereafter 107,376   107,376    
Total minimum lease obligations 187,270   187,270    
Less-amounts representing interest (64,363)   (64,363)    
Present value of minimum lease obligations 122,907   122,907    
Current maturities (12,172)   (12,172)   (12,197)
Lease obligations, net of current maturities $ 110,735   $ 110,735   $ 111,794
Minimum          
Finance leases-fiber lease agreements          
Initial terms 15 years   15 years    
Maximum          
Finance leases-fiber lease agreements          
Initial terms 20 years   20 years