Segment Information - Selected Financial Data for Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
External revenues [Abstract]
Service revenues	$ 139,692	$ 115,860	$ 279,337	$ 197,338
Other	13,566	14,449	27,801	25,542
Total external revenues	153,258	130,309	307,138	222,880
Internal revenues	0	0	0	0
Total operating revenues	153,258	130,309	307,138	222,880
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	53,381	50,296	107,142	82,057
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	43,022	33,694	83,175	55,120
Integration and acquisition expenses	3,678	20,054	8,167	20,386
Depreciation and amortization	44,925	32,415	89,729	50,154
Total operating expenses	145,006	136,459	288,213	207,717
Operating income (loss)	8,252	(6,150)	18,925	15,163
Operating Segments | Wireless
External revenues [Abstract]
Service revenues	107,681	86,873	215,867	139,052
Other	5,218	6,280	11,261	9,484
Total external revenues	112,899	93,153	227,128	148,536
Internal revenues	1,234	1,141	2,468	2,276
Total operating revenues	114,133	94,294	229,596	150,812
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	38,469	35,236	76,788	51,815
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	29,637	23,010	58,101	34,524
Integration and acquisition expenses	4,124	5,276	7,916	5,276
Depreciation and amortization	35,551	23,495	71,303	31,988
Total operating expenses	107,781	87,017	214,108	123,603
Operating income (loss)	6,352	7,277	15,488	27,209
Operating Segments | Cable
External revenues [Abstract]
Service revenues	26,883	24,167	53,294	48,507
Other	2,095	1,923	4,129	3,768
Total external revenues	28,978	26,090	57,423	52,275
Internal revenues	586	311	1,154	572
Total operating revenues	29,564	26,401	58,577	52,847
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	14,911	14,564	30,139	29,210
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	4,867	4,794	9,725	9,902
Integration and acquisition expenses	0	0	0	0
Depreciation and amortization	6,090	5,879	11,879	11,974
Total operating expenses	25,868	25,237	51,743	51,086
Operating income (loss)	3,696	1,164	6,834	1,761
Operating Segments | Wireline
External revenues [Abstract]
Service revenues	5,128	4,820	10,176	9,779
Other	6,253	6,246	12,411	12,290
Total external revenues	11,381	11,066	22,587	22,069
Internal revenues	8,195	7,525	16,143	14,901
Total operating revenues	19,576	18,591	38,730	36,970
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	9,330	8,808	18,603	17,450
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	1,683	1,670	3,359	3,275
Integration and acquisition expenses	0	0	0	0
Depreciation and amortization	3,155	2,933	6,286	5,967
Total operating expenses	14,168	13,411	28,248	26,692
Operating income (loss)	5,408	5,180	10,482	10,278
Operating Segments | Other
External revenues [Abstract]
Service revenues	0	0	0	0
Other	0	0	0	0
Total external revenues	0	0	0	0
Internal revenues	0	0		0
Total operating revenues	0	0	0	0
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	0	0	0	0
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	7,521	4,885	13,367	8,750
Integration and acquisition expenses	(446)	14,778	251	15,110
Depreciation and amortization	129	108	261	225
Total operating expenses	7,204	19,771	13,879	24,085
Operating income (loss)	(7,204)	(19,771)	(13,879)	(24,085)
Intersegment Eliminations
External revenues [Abstract]
Service revenues	0	0	0	0
Other	0	0	0	0
Total external revenues	0	0	0	0
Internal revenues	(10,015)	(8,977)	(19,765)	(17,749)
Total operating revenues	(10,015)	(8,977)	(19,765)	(17,749)
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	(9,329)	(8,312)	(18,388)	(16,418)
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	(686)	(665)	(1,377)	(1,331)
Integration and acquisition expenses	0	0	0	0
Depreciation and amortization	0	0	0	0
Total operating expenses	(10,015)	(8,977)	(19,765)	(17,749)
Operating income (loss)	$ 0	$ 0	$ 0	$ 0