Segment Reporting - Selected Financial Data for Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
External revenue
Total revenue	$ 153,188	$ 158,843
Operating expenses
Selling, general and administrative	30,991	28,722
Depreciation and amortization	36,911	41,179
Total operating expenses	130,138	134,056
Operating income	23,050	24,787
Wireless
External revenue
Total revenue	104,138	112,621
Broadband
External revenue
Total revenue	47,253	44,459
Tower
External revenue
Total revenue	1,797	1,763
Operating Segments | Wireless
External revenue
Total revenue	104,138	112,621
Operating expenses
Selling, general and administrative	9,428	11,079
Depreciation and amortization	25,299	30,370
Total operating expenses	80,694	88,408
Operating income	23,444	24,213
Operating Segments | Broadband
External revenue
Total revenue	49,786	46,881
Operating expenses
Selling, general and administrative	9,499	7,569
Depreciation and amortization	10,871	9,991
Total operating expenses	39,756	36,832
Operating income	10,030	10,049
Operating Segments | Tower
External revenue
Total revenue	3,730	3,033
Operating expenses
Selling, general and administrative	526	283
Depreciation and amortization	470	680
Total operating expenses	1,935	1,909
Operating income	1,795	1,124
Intersegment Eliminations
External revenue
Total revenue	(4,466)	(3,692)
Intersegment Eliminations | Wireless
External revenue
Total revenue	0	0
Intersegment Eliminations | Broadband
External revenue
Total revenue	2,533	2,422
Intersegment Eliminations | Tower
External revenue
Total revenue	1,933	1,270
Corporate, Non-Segment
Operating expenses
Selling, general and administrative	11,538	9,791
Depreciation and amortization	271	138
Total operating expenses	7,753	6,907
Operating income	(12,219)	(10,599)
Postpaid
External revenue
Total revenue	74,928	76,182
Postpaid | Operating Segments | Wireless
External revenue
Total revenue	74,928	76,182
Postpaid | Operating Segments | Broadband
External revenue
Total revenue	0	0
Postpaid | Operating Segments | Tower
External revenue
Total revenue	0	0
Prepaid
External revenue
Total revenue	13,109	13,130
Prepaid | Operating Segments | Wireless
External revenue
Total revenue	13,109	13,130
Prepaid | Operating Segments | Broadband
External revenue
Total revenue	0	0
Prepaid | Operating Segments | Tower
External revenue
Total revenue	0	0
Tower lease
External revenue
Total revenue	1,797	1,763
Tower lease | Operating Segments | Wireless
External revenue
Total revenue	0	0
Tower lease | Operating Segments | Broadband
External revenue
Total revenue	0	0
Tower lease | Operating Segments | Tower
External revenue
Total revenue	1,797	1,763
Cable, residential and SMB (1)
External revenue
Total revenue	34,943	32,426
Cable, residential and SMB (1) | Operating Segments | Wireless
External revenue
Total revenue	0	0
Cable, residential and SMB (1) | Operating Segments | Broadband
External revenue
Total revenue	34,943	32,426
Cable, residential and SMB (1) | Operating Segments | Tower
External revenue
Total revenue	0	0
Fiber, enterprise and wholesale
External revenue
Total revenue	5,488	4,828
Fiber, enterprise and wholesale | Operating Segments | Wireless
External revenue
Total revenue	0	0
Fiber, enterprise and wholesale | Operating Segments | Broadband
External revenue
Total revenue	5,488	4,828
Fiber, enterprise and wholesale | Operating Segments | Tower
External revenue
Total revenue	0	0
Rural local exchange carrier
External revenue
Total revenue	4,756	5,238
Rural local exchange carrier | Operating Segments | Wireless
External revenue
Total revenue	0	0
Rural local exchange carrier | Operating Segments | Broadband
External revenue
Total revenue	4,756	5,238
Rural local exchange carrier | Operating Segments | Tower
External revenue
Total revenue	0	0
Travel, installation, and other
External revenue
Total revenue	5,167	9,664
Travel, installation, and other | Operating Segments | Wireless
External revenue
Total revenue	3,351	8,018
Travel, installation, and other | Operating Segments | Broadband
External revenue
Total revenue	1,816	1,646
Travel, installation, and other | Operating Segments | Tower
External revenue
Total revenue	0	0
Service revenue and other
External revenue
Total revenue	140,188	143,231
Service revenue and other | Operating Segments | Wireless
External revenue
Total revenue	91,388	97,330
Service revenue and other | Operating Segments | Broadband
External revenue
Total revenue	47,003	44,138
Service revenue and other | Operating Segments | Tower
External revenue
Total revenue	1,797	1,763
Equipment
External revenue
Total revenue	13,000	15,612
Equipment | Operating Segments | Wireless
External revenue
Total revenue	12,750	15,291
Equipment | Operating Segments | Broadband
External revenue
Total revenue	250	321
Equipment | Operating Segments | Tower
External revenue
Total revenue	0	0
Services
Operating expenses
Cost of services and cost of goods sold	49,565	49,518
Services | Operating Segments | Wireless
Operating expenses
Cost of services and cost of goods sold	33,439	32,532
Services | Operating Segments | Broadband
Operating expenses
Cost of services and cost of goods sold	19,243	19,061
Services | Operating Segments | Tower
Operating expenses
Cost of services and cost of goods sold	939	946
Services | Corporate, Non-Segment
Operating expenses
Cost of services and cost of goods sold	(4,056)	(3,021)
Products
Operating expenses
Cost of services and cost of goods sold	12,671	14,637
Products | Operating Segments | Wireless
Operating expenses
Cost of services and cost of goods sold	12,528	14,427
Products | Operating Segments | Broadband
Operating expenses
Cost of services and cost of goods sold	143	211
Products | Operating Segments | Tower
Operating expenses
Cost of services and cost of goods sold	0	0
Products | Corporate, Non-Segment
Operating expenses
Cost of services and cost of goods sold	$ 0	$ (1)