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Segment Reporting - Selected Financial Data for Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
External revenue
Service revenue and other	$ 62,244	$ 55,173	$ 182,635	$ 162,643
Operating expenses
Cost of services	25,426	22,669	73,044	65,167
Selling, general and administrative	20,238	20,039	60,711	64,227
Restructuring expense	1,160	0	1,821	0
Depreciation and amortization	14,248	11,995	40,813	36,010
Operating income (loss)	1,172	470	6,246	(2,761)
Operating Segments
Operating expenses
Selling, general and administrative	20,238	20,039	60,711	64,227
Restructuring expense	1,160		1,821
Depreciation and amortization	14,248	11,995	40,813	36,010
Total operating expenses	61,072	54,703	176,389	165,404
Operating income (loss)	1,172	470	6,246	(2,761)
Operating Segments | Broadband
External revenue
Service revenue and other	57,913	50,710	169,294	150,630
Operating expenses
Selling, general and administrative	11,898	9,792	35,429	28,960
Restructuring expense	71		203
Depreciation and amortization	12,211	10,106	35,747	30,448
Total operating expenses	48,192	41,224	140,654	120,980
Operating income (loss)	9,721	9,486	28,640	29,650
Operating Segments | Tower
External revenue
Service revenue and other	4,449	4,501	13,728	12,490
Operating expenses
Selling, general and administrative	314	330	886	1,095
Restructuring expense	0		0
Depreciation and amortization	468	467	1,398	1,414
Total operating expenses	2,286	2,080	6,354	6,046
Operating income (loss)	2,163	2,421	7,374	6,444
Intersegment Eliminations
External revenue
Service revenue and other	74	4,699	9,225	13,341
Intersegment Eliminations | Broadband
External revenue
Service revenue and other	99	2,100	4,409	6,818
Intersegment Eliminations | Tower
External revenue
Service revenue and other	93	2,637	5,203	7,000
Intersegment Eliminations | Corporate & Eliminations
External revenue
Service revenue and other	(118)	(38)	(387)	(477)
Corporate, Non-Segment
Operating expenses
Selling, general and administrative	8,026	9,917	24,396	34,172
Restructuring expense	1,089		1,618
Depreciation and amortization	1,569	1,422	3,668	4,148
Total operating expenses	10,594	11,399	29,381	38,378
Operating income (loss)	(10,712)	(11,437)	(29,768)	(38,855)
Residential & SMB | Operating Segments
External revenue
Service revenue and other	44,783	39,477	131,702	114,170
Residential & SMB | Operating Segments | Broadband
External revenue
Service revenue and other	44,783	39,477	131,702	114,170
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	9,059	5,280	21,975	17,762
Commercial Fiber | Operating Segments | Broadband
External revenue
Service revenue and other	9,059	5,280	21,975	17,762
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	3,972	3,853	11,208	11,880
RLEC & Other | Operating Segments | Broadband
External revenue
Service revenue and other	3,972	3,853	11,208	11,880
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	4,356	1,864	8,525	5,490
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	4,356	1,864	8,525	5,490
Service revenue and other | Operating Segments
External revenue
Service revenue and other	62,170	50,474	173,410	149,302
Service revenue and other | Operating Segments | Broadband
External revenue
Service revenue and other	57,814	48,610	164,885	143,812
Service revenue and other | Operating Segments | Tower
External revenue
Service revenue and other	4,356	1,864	8,525	5,490
Cost of services | Operating Segments
Operating expenses
Cost of services	25,426	22,669	73,044	65,167
Cost of services | Operating Segments | Broadband
Operating expenses
Cost of services	24,012	21,326	69,275	61,572
Cost of services | Operating Segments | Tower
Operating expenses
Cost of services	1,504	1,283	4,070	3,537
Cost of services | Corporate, Non-Segment
Operating expenses
Cost of services	$ (90)	$ 60	$ (301)	$ 58

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