Segment Reporting - Selected Financial Data for Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
External revenue
Service revenue and other	$ 60,700	$ 54,336	$ 120,391	$ 107,470
Operating expenses
Cost of services	24,335	22,181	47,618	42,498
Selling, general and administrative	20,320	22,092	40,473	44,188
Restructuring expense	43	0	661	0
Depreciation and amortization	13,299	11,930	26,565	24,015
Operating income (loss)	2,703	(1,867)	5,074	(3,231)
Operating Segments
Operating expenses
Selling, general and administrative	20,320	22,092	40,473	44,188
Restructuring expense	43		661
Depreciation and amortization	13,299	11,930	26,565	24,015
Total operating expenses	57,997	56,203	115,317	110,701
Operating income (loss)	2,703	(1,867)	5,074	(3,231)
Operating Segments | Broadband
External revenue
Service revenue and other	56,227	50,133	111,381	99,919
Operating expenses
Selling, general and administrative	12,806	9,465	23,531	19,169
Restructuring expense	27		132
Depreciation and amortization	11,775	10,307	23,536	20,341
Total operating expenses	47,735	40,633	92,462	79,757
Operating income (loss)	8,492	9,500	18,919	20,162
Operating Segments | Tower
External revenue
Service revenue and other	4,614	4,259	9,279	7,989
Operating expenses
Selling, general and administrative	338	238	572	764
Restructuring expense	0		0
Depreciation and amortization	449	477	930	947
Total operating expenses	2,105	2,030	4,068	3,965
Operating income (loss)	2,509	2,229	5,211	4,024
Intersegment Eliminations
External revenue
Service revenue and other	4,556	4,559	9,151	8,643
Intersegment Eliminations | Broadband
External revenue
Service revenue and other	2,102	2,185	4,310	4,718
Intersegment Eliminations | Tower
External revenue
Service revenue and other	2,595	2,430	5,110	4,363
Intersegment Eliminations | Corporate & Eliminations
External revenue
Service revenue and other	(141)	(56)	(269)	(438)
Corporate, Non-Segment
Operating expenses
Selling, general and administrative	7,176	12,389	16,370	24,255
Restructuring expense	16		529
Depreciation and amortization	1,075	1,146	2,099	2,727
Total operating expenses	8,157	13,540	18,787	26,979
Operating income (loss)	(8,298)	(13,596)	(19,056)	(27,417)
Residential & SMB | Operating Segments
External revenue
Service revenue and other	43,989	37,684	86,919	74,693
Residential & SMB | Operating Segments | Broadband
External revenue
Service revenue and other	43,989	37,684	86,919	74,693
Residential & SMB | Operating Segments | Tower
External revenue
Service revenue and other	0	0	0	0
Commercial Fiber | Operating Segments
External revenue
Service revenue and other	6,531	6,282	12,916	12,482
Commercial Fiber | Operating Segments | Broadband
External revenue
Service revenue and other	6,531	6,282	12,916	12,482
Commercial Fiber | Operating Segments | Tower
External revenue
Service revenue and other	0	0	0	0
RLEC & Other | Operating Segments
External revenue
Service revenue and other	3,605	3,982	7,236	8,026
RLEC & Other | Operating Segments | Broadband
External revenue
Service revenue and other	3,605	3,982	7,236	8,026
RLEC & Other | Operating Segments | Tower
External revenue
Service revenue and other	0	0	0	0
Tower lease | Operating Segments
External revenue
Service revenue and other	2,019	1,829	4,169	3,626
Tower lease | Operating Segments | Broadband
External revenue
Service revenue and other	0	0	0	0
Tower lease | Operating Segments | Tower
External revenue
Service revenue and other	2,019	1,829	4,169	3,626
Service revenue and other | Operating Segments
External revenue
Service revenue and other	56,144	49,777	111,240	98,827
Service revenue and other | Operating Segments | Broadband
External revenue
Service revenue and other	54,125	47,948	107,071	95,201
Service revenue and other | Operating Segments | Tower
External revenue
Service revenue and other	2,019	1,829	4,169	3,626
Cost of services | Operating Segments
Operating expenses
Cost of services	24,335	22,181	47,618	42,498
Cost of services | Operating Segments | Broadband
Operating expenses
Cost of services	23,127	20,861	45,263	40,247
Cost of services | Operating Segments | Tower
Operating expenses
Cost of services	1,318	1,315	2,566	2,254
Cost of services | Corporate, Non-Segment
Operating expenses
Cost of services	$ (110)	$ 5	$ (211)	$ (3)