Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	38 Months Ended
Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Total non-amortizing intangibles	$ 64,475	$ 64,475	$ 64,475		$ 64,475
Gross Carrying Amount	483,833	483,833	483,833		496,776
Accumulated Amortization and Other	(223,418)	(223,418)	(223,418)		(195,222)
Net	260,415	260,415	260,415		301,554
Total intangible assets, gross	548,308	548,308	548,308		561,251
Total intangible assets, net	324,890	324,890	324,890	$ 352,201	366,029
Waived management fees under affiliate agreement	9,700	19,300	117,700
Waived management fees under affiliate agreement, expected to be collected		137,900
Sprint affiliate contract expansion - Wireless
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	455,305	455,305	455,305		455,305
Accumulated Amortization and Other	(197,783)	(197,783)	(197,783)		(167,830)
Net	257,522	257,522	257,522		287,475
Favorable leases - Wireless
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	0	0		15,743
Accumulated Amortization and Other	0	0	0		(1,919)
Net	0	0	0		13,824
Acquired subscribers - Cable
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	28,065	28,065	28,065		25,265
Accumulated Amortization and Other	(25,399)	(25,399)	(25,399)		(25,250)
Net	2,666	2,666	2,666		15
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	463	463	463		463
Accumulated Amortization and Other	(236)	(236)	(236)		(223)
Net	227	227	227		240
Cable franchise rights
Finite-Lived Intangible Assets [Line Items]
Total non-amortizing intangibles	64,334	64,334	64,334		64,334
Railroad crossing rights
Finite-Lived Intangible Assets [Line Items]
Total non-amortizing intangibles	$ 141	$ 141	$ 141		$ 141

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