Segment Reporting - Selected Financial Data for Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
External revenues
Service revenues									$ 558,910	$ 478,485	$ 301,118
Other revenues									53,081	56,803	41,367
Total operating revenues	$ 151,617	$ 152,382	$ 153,867	$ 154,125	$ 155,572	$ 156,836	$ 130,309	$ 92,571	611,991	535,288	342,485
Operating expenses
Cost of goods and services									211,507	193,520	121,330
Selling, general and administrative									165,937	133,325	72,821
Acquisition, integration and migration expenses									11,030	42,232	3,546
Depreciation and amortization									177,007	143,685	70,702
Operating Expenses									565,481	512,762	268,399
Operating income (loss)	$ 18,110	$ 9,475	$ 8,252	$ 10,673	$ 12,189	$ (3,929)	$ (7,046)	$ 21,312	46,510	22,526	74,086
Capital Expenditures									146,489	173,231	69,679
Wireless [Member]
External revenues
Service revenues									431,184	359,769	192,752
Other revenues									18,945	24,364	11,609
Total operating revenues									450,129	384,133	204,361
Operating expenses
Capital Expenditures									82,620	123,400	25,200
Cable [Member]
External revenues
Service revenues									107,338	99,070	88,980
Other revenues									8,579	7,927	7,793
Total operating revenues									115,917	106,997	96,773
Operating expenses
Capital Expenditures									34,487	32,400	20,400
Wireline [Member]
External revenues
Service revenues									20,388	19,646	19,386
Other revenues									25,557	24,512	21,965
Total operating revenues									45,945	44,158	41,351
Operating expenses
Capital Expenditures									22,581	20,200	22,100
Other Segments [Member]
External revenues
Service revenues									0	0	0
Other revenues									0	0	0
Total operating revenues									0	0	0
Operating expenses
Capital Expenditures									6,801	(2,769)	1,979
Operating Segments | Wireless [Member]
External revenues
Total operating revenues									455,078	388,753	208,801
Operating expenses
Cost of goods and services									152,279	133,113	63,570
Selling, general and administrative									118,257	95,851	35,792
Acquisition, integration and migration expenses									10,793	25,927	0
Depreciation and amortization									139,610	107,621	34,416
Operating Expenses									420,939	362,512	133,778
Operating income (loss)									34,139	26,241	75,023
Operating Segments | Cable [Member]
External revenues
Total operating revenues									119,162	108,734	97,622
Operating expenses
Cost of goods and services									59,349	58,581	54,611
Selling, general and administrative									19,999	19,248	19,412
Acquisition, integration and migration expenses									0	0	0
Depreciation and amortization									23,968	23,908	23,097
Operating Expenses									103,316	101,737	97,120
Operating income (loss)									15,846	6,997	502
Operating Segments | Wireline [Member]
External revenues
Total operating revenues									79,253	74,974	67,420
Operating expenses
Cost of goods and services									38,536	36,259	31,668
Selling, general and administrative									6,923	6,474	6,612
Acquisition, integration and migration expenses									0	0	0
Depreciation and amortization									12,829	11,717	12,736
Operating Expenses									58,288	54,450	51,016
Operating income (loss)									20,965	20,524	16,404
Operating Segments | Other Segments [Member]
External revenues
Total operating revenues									0	0	0
Operating expenses
Cost of goods and services									39	0	0
Selling, general and administrative									23,564	14,492	13,844
Acquisition, integration and migration expenses									237	16,305	3,546
Depreciation and amortization									600	439	453
Operating Expenses									24,440	31,236	17,843
Operating income (loss)									(24,440)	(31,236)	(17,843)
Intersegment Eliminations [Member]
External revenues
Total operating revenues									(41,502)	(37,173)	(31,358)
Operating expenses
Cost of goods and services									(38,696)	(34,433)	(28,519)
Selling, general and administrative									(2,806)	(2,740)	(2,839)
Acquisition, integration and migration expenses									0	0	0
Depreciation and amortization									0	0	0
Operating Expenses									(41,502)	(37,173)	(31,358)
Operating income (loss)									0	0	0
Capital Expenditures									0	0	0
Intersegment Eliminations [Member] | Wireless [Member]
External revenues
Total operating revenues									4,949	4,620	4,440
Intersegment Eliminations [Member] | Cable [Member]
External revenues
Total operating revenues									3,245	1,737	849
Intersegment Eliminations [Member] | Wireline [Member]
External revenues
Total operating revenues									33,308	30,816	26,069
Intersegment Eliminations [Member] | Other Segments [Member]
External revenues
Total operating revenues									$ 0	$ 0	$ 0