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Segment Reporting - Selected Financial Data for Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
External revenue
Operating revenues	$ 155,152	$ 158,731	$ 472,909	$ 469,370
Operating expenses:
Selling, general and administrative	27,178	27,452	83,070	86,117
Depreciation and amortization	36,626	40,028	120,158	124,632
Total operating expenses	129,793	130,402	398,743	403,118
Operating income	25,359	28,329	74,166	66,252
Wireless
External revenue
Operating revenues	109,138	114,836	336,392	339,910
Cable
External revenue
Operating revenues	33,513	30,916	98,962	92,610
Wireline
External revenue
Operating revenues	12,501	12,979	37,555	36,850
Other
External revenue
Operating revenues	0	0	0	0
Eliminations
External revenue
Operating revenues	0	0	0	0
Intersegment Eliminations | Wireless
External revenue
Operating revenues	(1,290)	(1,263)	(3,830)	(3,746)
Intersegment Eliminations | Cable
External revenue
Operating revenues	(1,591)	(1,266)	(4,541)	(3,394)
Intersegment Eliminations | Wireline
External revenue
Operating revenues	(6,643)	(6,643)	(20,025)	(21,591)
Intersegment Eliminations | Other
External revenue
Operating revenues	0	0	0	0
Intersegment Eliminations | Eliminations
External revenue
Operating revenues	(9,524)	(9,172)	(28,396)	(28,731)
Operating expenses:
Selling, general and administrative	(750)	(714)	(2,118)	(2,043)
Depreciation and amortization	0	0	0	0
Total operating expenses	(9,524)	(9,172)	(28,396)	(28,731)
Operating income	0	0	0	0
Operating Segments | Wireless
External revenue
Operating revenues	110,428	116,099	340,222	343,656
Operating expenses:
Selling, general and administrative	9,882	11,191	31,836	35,693
Depreciation and amortization	27,200	30,363	90,469	95,853
Total operating expenses	86,697	88,747	269,130	276,786
Operating income	23,731	27,352	71,092	66,870
Operating Segments | Cable
External revenue
Operating revenues	35,104	32,182	103,503	96,004
Operating expenses:
Selling, general and administrative	6,636	5,331	17,898	14,940
Depreciation and amortization	6,226	6,102	19,239	18,305
Total operating expenses	28,808	26,348	84,718	78,560
Operating income	6,296	5,834	18,785	17,444
Operating Segments | Wireline
External revenue
Operating revenues	19,144	19,622	57,580	58,441
Operating expenses:
Selling, general and administrative	1,938	1,780	5,769	5,183
Depreciation and amortization	3,077	3,435	10,057	10,069
Total operating expenses	14,217	14,500	43,213	43,754
Operating income	4,927	5,122	14,367	14,687
Operating Segments | Other
External revenue
Operating revenues	0	0	0	0
Operating expenses:
Selling, general and administrative	9,472	9,864	29,685	32,344
Depreciation and amortization	123	128	393	405
Total operating expenses	9,595	9,979	30,078	32,749
Operating income	(9,595)	(9,979)	(30,078)	(32,749)
Service revenue
External revenue
Operating revenues	127,383	130,320	390,272	386,003
Service revenue | Wireless
External revenue
Operating revenues	91,108	96,299	282,533	284,154
Service revenue | Cable
External revenue
Operating revenues	30,829	28,578	91,250	85,797
Service revenue | Wireline
External revenue
Operating revenues	5,446	5,443	16,489	16,052
Service revenue | Other
External revenue
Operating revenues	0	0	0	0
Service revenue | Eliminations
External revenue
Operating revenues	0	0		0
Equipment revenue
External revenue
Operating revenues	16,320	15,963	48,787	49,551
Equipment revenue | Wireless
External revenue
Operating revenues	15,975	15,666	47,814	48,859
Equipment revenue | Cable
External revenue
Operating revenues	292	234	817	537
Equipment revenue | Wireline
External revenue
Operating revenues	53	63	156	155
Equipment revenue | Other
External revenue
Operating revenues	0	0	0	0
Equipment revenue | Eliminations
External revenue
Operating revenues	0	0		0
Tower revenue
External revenue
Operating revenues	1,660	1,639	4,985	4,934
Tower revenue | Wireless
External revenue
Operating revenues	1,660	1,639	4,985	4,934
Tower revenue | Cable
External revenue
Operating revenues	0	0	0	0
Tower revenue | Wireline
External revenue
Operating revenues	0	0	0	0
Tower revenue | Other
External revenue
Operating revenues	0	0	0	0
Tower revenue | Eliminations
External revenue
Operating revenues	0	0		0
Other revenue
External revenue
Operating revenues	9,789	10,809	28,865	28,882
Other revenue | Wireless
External revenue
Operating revenues	395	1,232	1,060	1,963
Other revenue | Cable
External revenue
Operating revenues	2,392	2,104	6,895	6,276
Other revenue | Wireline
External revenue
Operating revenues	7,002	7,473	20,910	20,643
Other revenue | Other
External revenue
Operating revenues	0	0	0	0
Other revenue | Eliminations
External revenue
Operating revenues	0	0		0
Cost of services
Operating expenses:
Cost of services	50,164	47,886	149,179	146,362
Cost of services | Intersegment Eliminations | Eliminations
Operating expenses:
Cost of services	(8,774)	(8,458)	(26,278)	(26,688)
Cost of services | Operating Segments | Wireless
Operating expenses:
Cost of services	34,044	32,253	101,085	99,491
Cost of services | Operating Segments | Cable
Operating expenses:
Cost of services	15,790	14,837	47,138	45,118
Cost of services | Operating Segments | Wireline
Operating expenses:
Cost of services	9,104	9,266	27,234	28,441
Cost of services | Operating Segments | Other
Operating expenses:
Cost of services	0	(12)	0	0
Cost of goods sold
Operating expenses:
Cost of services	15,825	15,036	46,336	46,007
Cost of goods sold | Intersegment Eliminations | Eliminations
Operating expenses:
Cost of services	0	0	0	0
Cost of goods sold | Operating Segments | Wireless
Operating expenses:
Cost of services	15,571	14,940	45,740	45,749
Cost of goods sold | Operating Segments | Cable
Operating expenses:
Cost of services	156	78	443	197
Cost of goods sold | Operating Segments | Wireline
Operating expenses:
Cost of services	98	19	153	61
Cost of goods sold | Operating Segments | Other
Operating expenses:
Cost of services	$ 0	$ (1)	$ 0	$ 0

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