Segment Information - Selected Financial Data for Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
External revenues [Abstract]
Service revenues	$ 139,645	$ 81,479
Other	14,235	11,092
Total external revenues	153,880	92,571
Internal revenues	0	0
Total operating revenues	153,880	92,571
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	53,761	31,762
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	40,153	21,426
Integration and acquisition expenses	4,489	332
Depreciation and amortization	44,804	17,739
Total operating expenses	143,207	71,259
Operating income	10,673	21,312
Operating Segments | Wireless
External revenues [Abstract]
Service revenues	108,186	52,179
Other	6,042	3,203
Total external revenues	114,228	55,382
Internal revenues	1,235	1,136
Total operating revenues	115,463	56,518
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	38,318	16,578
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	28,464	11,514
Integration and acquisition expenses	3,792	0
Depreciation and amortization	35,752	8,494
Total operating expenses	106,326	36,586
Operating income	9,137	19,932
Operating Segments | Cable
External revenues [Abstract]
Service revenues	26,411	24,340
Other	2,035	1,846
Total external revenues	28,446	26,186
Internal revenues	567	260
Total operating revenues	29,013	26,446
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	15,228	14,647
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	4,858	5,108
Integration and acquisition expenses	0	0
Depreciation and amortization	5,788	6,095
Total operating expenses	25,874	25,850
Operating income	3,139	596
Operating Segments | Wireline
External revenues [Abstract]
Service revenues	5,048	4,960
Other	6,158	6,043
Total external revenues	11,206	11,003
Internal revenues	7,948	7,376
Total operating revenues	19,154	18,379
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	9,273	8,643
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	1,676	1,605
Integration and acquisition expenses	0	0
Depreciation and amortization	3,132	3,033
Total operating expenses	14,081	13,281
Operating income	5,073	5,098
Operating Segments | Other Segments
External revenues [Abstract]
Service revenues	0	0
Other	0	0
Total external revenues	0	0
Internal revenues	0
Total operating revenues	0	0
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	0	0
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	5,847	3,865
Integration and acquisition expenses	697	332
Depreciation and amortization	132	117
Total operating expenses	6,676	4,314
Operating income	(6,676)	(4,314)
Intersegment Eliminations
External revenues [Abstract]
Service revenues	0	0
Other	0
Total external revenues	0	0
Internal revenues	(9,750)	(8,772)
Total operating revenues	(9,750)	(8,772)
Operating expenses:
Costs of goods and services, exclusive of depreciation and amortization shown separately below	(9,058)	(8,106)
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	(692)	(666)
Integration and acquisition expenses	0	0
Depreciation and amortization	0	0
Total operating expenses	(9,750)	(8,772)
Operating income	$ 0	$ 0