Description of the business: Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Finance leases-fiber lease agreements
Initial terms	20 years		20 years
Additional finance lease future payments due	$ 132,200		$ 132,200
Cash paid for amounts included in the measurement of lease liabilities
Finance lease cost amortization of right-of-use assets	8,411	$ 7,000	17,426	$ 13,998
Interest expense on finance lease liabilities	6,565	5,116	12,995	10,197
Operating lease cost	27,730	4,628	32,312	9,401
Total lease costs	$ 42,706	$ 16,744	62,733	33,596
Operating cash flows from finance leases			(11,268)	(11,083)
Operating cash flows from operating leases			(32,957)	(9,543)
Financing cash flows from finance leases			(17,247)	(11,099)
Right-of-use assets obtained in exchange for new finance lease liabilities			42,639	23,685
Right-of-use assets obtained in exchange for new operating lease liabilities			$ 8,027	$ 9,429
Weighted-average remaining lease term - finance leases (in years)	13 years 8 months 12 days	12 years 8 months 12 days	13 years 8 months 12 days	12 years 8 months 12 days
Weighted-average remaining lease term - operating leases (in years)	9 years 10 months 24 days	18 years 1 month 6 days	9 years 10 months 24 days	18 years 1 month 6 days
Weighted average discount rate - finance leases	8.50%	8.70%	8.50%	8.70%
Weighted average discount rate - operating leases	7.30%	5.40%	7.30%	5.40%
Future minimum payments (principal and interest) under these finance leases
2024	$ 45,511		$ 45,511
2025	45,307		45,307
2026	38,138		38,138
2027	38,021		38,021
2028	38,800		38,800
Thereafter	367,639		367,639
Total minimum lease obligations	573,416		573,416
Less-amounts representing interest	(241,897)		(241,897)
Present value of minimum lease obligations	331,519		331,519
Current maturities	(20,114)		(20,114)		$ (17,182)
Finance lease obligations, net of current maturities	311,405		311,405		287,044
Future minimum payments under these operating lease agreements
2023	138,924		138,924
2024	123,723		123,723
2025	108,816		108,816
2026	78,498		78,498
2027	48,563		48,563
Thereafter	324,602		324,602
Total minimum lease obligations	823,126		823,126
Less-amounts representing interest	(241,862)		(241,862)
Present value of minimum lease obligations	581,264		581,264
Current maturities	(125,551)		(125,551)		(12,005)
Lease obligations, net of current maturities	455,713		455,713		$ 94,587
Unfavorable lease liabilities
Unfavorable lease liabilities	147,500		147,500
Amortization of unfavorable lease liabilities	$ 6,500		$ 6,500
Minimum
Finance leases-fiber lease agreements
Initial terms	15 years		15 years
Maximum
Finance leases-fiber lease agreements
Initial terms	20 years		20 years