Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) State	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Segment State	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segment Information [Abstract]
Number of reportable segments | Segment			3
Non Sprint operations, number of states | State	4		4
External revenues [Abstract]
Service revenues	$ 115,860	$ 75,755	$ 197,338	$ 150,281
Other	14,449	9,946	25,542	19,708
Total external revenues	130,309	85,701	222,880	169,989
Internal revenues	0	0	0	0
Total operating revenues	130,309	85,701	222,880	169,989
Operating expenses [Abstract]
Cost of goods and services, exclusive of depreciation and amortization shown separately below	50,296	30,280	82,057	60,970
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	33,694	18,606	55,120	36,718
Integration and acquisition expenses	20,054	402	20,386	1,024
Depreciation and amortization	32,415	17,663	50,154	34,001
Total operating expenses	136,459	66,951	207,717	132,713
Operating income (loss)	(6,150)	18,750	15,163	37,276
Reconciliation of income from continuing operations from segments to consolidated [Abstract]
Total consolidated operating income (loss)	(6,150)	18,750	15,163	37,276
Interest expense	(5,904)	(1,940)	(7,524)	(3,855)
Non-operating income, net	167	540	723	1,074
Income (loss) before income taxes	(11,887)	17,350	8,362	34,495
Assets by segment [Abstract]
Assets	1,455,841		1,455,841		$ 627,151
Other [Member]
Assets by segment [Abstract]
Assets	1,083,152		1,083,152		463,390
Total Segments [Member]
Assets by segment [Abstract]
Assets	2,547,881		2,547,881		983,609
Reportable Segments [Member] | Wireless [Member]
External revenues [Abstract]
Service revenues	86,873	48,749	139,052	97,124
Other	6,280	2,848	9,484	5,878
Total external revenues	93,153	51,597	148,536	103,002
Internal revenues	1,141	1,105	2,276	2,209
Total operating revenues	94,294	52,702	150,812	105,211
Operating expenses [Abstract]
Cost of goods and services, exclusive of depreciation and amortization shown separately below	35,236	15,903	51,815	32,090
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	23,010	8,917	34,524	17,969
Integration and acquisition expenses	5,276	0	5,276	0
Depreciation and amortization	23,495	8,612	31,988	16,444
Total operating expenses	87,017	33,432	123,603	66,503
Operating income (loss)	7,277	19,270	27,209	38,708
Reconciliation of income from continuing operations from segments to consolidated [Abstract]
Total consolidated operating income (loss)	7,277	19,270	27,209	38,708
Assets by segment [Abstract]
Assets	1,142,459		1,142,459		205,718
Reportable Segments [Member] | Cable [Member]
External revenues [Abstract]
Service revenues	24,167	22,117	48,507	43,518
Other	1,923	1,850	3,768	3,613
Total external revenues	26,090	23,967	52,275	47,131
Internal revenues	311	186	572	334
Total operating revenues	26,401	24,153	52,847	47,465
Operating expenses [Abstract]
Cost of goods and services, exclusive of depreciation and amortization shown separately below	14,564	13,635	29,210	27,253
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	4,794	5,084	9,902	9,976
Integration and acquisition expenses	0	0	0	0
Depreciation and amortization	5,879	5,859	11,974	11,338
Total operating expenses	25,237	24,578	51,086	48,567
Operating income (loss)	1,164	(425)	1,761	(1,102)
Reconciliation of income from continuing operations from segments to consolidated [Abstract]
Total consolidated operating income (loss)	1,164	(425)	1,761	(1,102)
Assets by segment [Abstract]
Assets	210,542		210,542		209,132
Reportable Segments [Member] | Wireline [Member]
External revenues [Abstract]
Service revenues	4,820	4,889	9,779	9,639
Other	6,246	5,248	12,290	10,217
Total external revenues	11,066	10,137	22,069	19,856
Internal revenues	7,525	6,326	14,901	12,192
Total operating revenues	18,591	16,463	36,970	32,048
Operating expenses [Abstract]
Cost of goods and services, exclusive of depreciation and amortization shown separately below	8,808	7,677	17,450	15,011
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	1,670	1,736	3,275	3,234
Integration and acquisition expenses	0	0	0	0
Depreciation and amortization	2,933	3,083	5,967	6,007
Total operating expenses	13,411	12,496	26,692	24,252
Operating income (loss)	5,180	3,967	10,278	7,796
Reconciliation of income from continuing operations from segments to consolidated [Abstract]
Total consolidated operating income (loss)	5,180	3,967	10,278	7,796
Assets by segment [Abstract]
Assets	111,728		111,728		105,369
Reportable Segments [Member] | Other [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	0	0	0
Total operating revenues	0	0	0	0
Operating expenses [Abstract]
Cost of goods and services, exclusive of depreciation and amortization shown separately below	0	(16)	0	0
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	4,885	3,567	8,750	6,890
Integration and acquisition expenses	14,778	402	15,110	1,024
Depreciation and amortization	108	109	225	212
Total operating expenses	19,771	4,062	24,085	8,126
Operating income (loss)	(19,771)	(4,062)	(24,085)	(8,126)
Reconciliation of income from continuing operations from segments to consolidated [Abstract]
Total consolidated operating income (loss)	(19,771)	(4,062)	(24,085)	(8,126)
Eliminations [Member]
External revenues [Abstract]
Service revenues	0	0	0	0
Other	0	0	0	0
Total external revenues	0	0	0	0
Internal revenues	(8,977)	(7,617)	(17,749)	(14,735)
Total operating revenues	(8,977)	(7,617)	(17,749)	(14,735)
Operating expenses [Abstract]
Cost of goods and services, exclusive of depreciation and amortization shown separately below	(8,312)	(6,919)	(16,418)	(13,384)
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	(665)	(698)	(1,331)	(1,351)
Integration and acquisition expenses	0	0	0	0
Depreciation and amortization	0	0	0	0
Total operating expenses	(8,977)	(7,617)	(17,749)	(14,735)
Operating income (loss)	0	0	0	0
Reconciliation of income from continuing operations from segments to consolidated [Abstract]
Total consolidated operating income (loss)	0	$ 0	0	$ 0
Assets by segment [Abstract]
Assets	$ (1,092,040)		$ (1,092,040)		$ (356,458)