Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Non-amortizing intangibles:	$ 64,475	$ 64,431
Gross Carrying Amount	452,935	449,384
Accumulated Amortization	(95,738)	(59,283)
Net	357,197	390,101
Total intangible assets, gross	517,410	513,815
Intangible assets, net	421,672	454,532
Affiliate contract expansion
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	287,052	284,102
Accumulated Amortization	(29,593)	(14,030)
Net	257,459	270,072
Acquired subscribers – wireless
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	123,105	120,855
Accumulated Amortization	(36,871)	(18,738)
Net	86,234	102,117
Favorable leases - wireless
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	16,950	16,950
Accumulated Amortization	(3,985)	(1,130)
Net	12,965	15,820
Acquired subscribers – cable
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	25,265	25,265
Accumulated Amortization	(25,059)	(24,631)
Net	206	634
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	563	2,212
Accumulated Amortization	(230)	(754)
Net	333	1,458
Cable franchise rights
Finite-Lived Intangible Assets [Line Items]
Non-amortizing intangibles:	64,335	64,334
Railroad crossing rights
Finite-Lived Intangible Assets [Line Items]
Non-amortizing intangibles:	$ 140	$ 97