Segment Information - Selected Financial Data for Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
External revenues [Abstract]
Service revenues	$ 140,897	$ 74,981	$ 338,235	$ 225,262
Other	15,939	10,231	41,481	29,940
Total external revenues	156,836	85,212	379,716	255,202
Internal revenues	0	0	0	0
Total operating revenues	156,836	85,212	379,716	255,202
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	58,317	30,570	140,354	91,541
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	40,369	18,306	96,263	55,024
Integration and acquisition expenses	15,272	2,129	35,801	3,153
Total operating expenses	46,807	19,118	96,961	53,119
Total operating expenses	160,765	70,123	369,379	202,837
Operating income (loss)	(3,929)	15,089	10,337	52,365
Operating Segments [Member] | Wireless [Member]
External revenues [Abstract]
Service revenues	111,001	47,793	250,053	144,917
Other	7,978	2,734	17,461	8,611
Total external revenues	118,979	50,527	267,514	153,528
Internal revenues	1,140	1,109	3,417	3,319
Total operating revenues	120,119	51,636	270,931	156,847
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	43,097	15,572	94,892	47,661
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	29,892	9,027	65,219	26,996
Integration and acquisition expenses	14,499	0	19,889	0
Total operating expenses	38,038	9,644	70,026	26,089
Total operating expenses	125,526	34,243	250,026	100,746
Operating income (loss)	(5,407)	17,393	20,905	56,101
Operating Segments [Member] | Cable [Member]
External revenues [Abstract]
Service revenues	24,948	22,284	73,455	65,802
Other	2,031	1,882	5,799	5,495
Total external revenues	26,979	24,166	79,254	71,297
Internal revenues	587	251	1,159	585
Total operating revenues	27,566	24,417	80,413	71,882
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	14,654	14,124	43,864	41,378
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	4,770	4,948	14,672	14,924
Integration and acquisition expenses	0	0	0	0
Total operating expenses	5,860	5,948	17,834	17,286
Total operating expenses	25,284	25,020	76,370	73,588
Operating income (loss)	2,282	(603)	4,043	(1,706)
Operating Segments [Member] | Wireline [Member]
External revenues [Abstract]
Service revenues	4,948	4,904	14,727	14,543
Other	5,930	5,615	18,221	15,834
Total external revenues	10,878	10,519	32,948	30,377
Internal revenues	7,854	6,759	22,754	18,950
Total operating revenues	18,732	17,278	55,702	49,327
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	9,442	8,212	26,892	23,224
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	1,676	1,688	4,951	4,923
Integration and acquisition expenses	0	0	0	0
Total operating expenses	2,822	3,404	8,789	9,411
Total operating expenses	13,940	13,304	40,632	37,558
Operating income (loss)	4,792	3,974	15,070	11,769
Operating Segments [Member] | Other Segments [Member]
External revenues [Abstract]
Service revenues	0	0	0	0
Other	0	0	0	0
Total external revenues	0	0	0	0
Internal revenues	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	4,736	3,424	13,457	10,313
Integration and acquisition expenses	773	2,129	15,912	3,153
Total operating expenses	87	122	312	333
Total operating expenses	5,596	5,675	29,681	13,799
Operating income (loss)	(5,596)	(5,675)	(29,681)	(13,799)
Intersegment Eliminations [Member]
External revenues [Abstract]
Service revenues	0	0	0	0
Other	0		0	0
Total external revenues	0	0	0	0
Internal revenues	(9,581)	(8,119)	(27,330)	(22,854)
Total operating revenues	(9,581)	(8,119)	(27,330)	(22,854)
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	(8,876)	(7,338)	(25,294)	(20,722)
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	(705)	(781)	(2,036)	(2,132)
Integration and acquisition expenses	0	0	0	0
Total operating expenses	0	0	0	0
Total operating expenses	(9,581)	(8,119)	(27,330)	(22,854)
Operating income (loss)	$ 0	$ 0	$ 0	$ 0