Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Feb. 01, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Total non-amortizing intangibles	$ 64,475		$ 64,475
Gross Carrying Amount	496,792		448,988
Accumulated Amortization and Other	(164,359)		(132,484)
Net	332,433	$ 52,000	316,504
Total intangible assets, gross	561,267		513,463
Total intangible assets, net	396,908		380,979
Waived management fees under affiliate agreement	79,200
Affiliate contract expansion - wireless
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	455,306		410,157
Accumulated Amortization and Other	(137,437)		(105,964)
Net	317,869	45,148	304,193
Favorable leases - wireless
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,758		13,103
Accumulated Amortization and Other	(1,537)		(1,222)
Net	14,221	$ 3,665	11,881
Acquired subscribers - cable
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	25,265		25,265
Accumulated Amortization and Other	(25,174)		(25,100)
Net	91		165
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	463		463
Accumulated Amortization and Other	(211)		(198)
Net	252		265
Cable franchise rights
Finite-Lived Intangible Assets [Line Items]
Total non-amortizing intangibles	64,334		64,334
Railroad crossing rights
Finite-Lived Intangible Assets [Line Items]
Total non-amortizing intangibles	$ 141		$ 141