Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Total indefinite-lived intangibles	$ 78,314	$ 78,314
Gross Carrying Amount	488,492	488,492
Accumulated Amortization and Other	(267,348)	(252,659)
Net	221,144	235,833
Total intangible assets, gross carrying amount	566,806	566,806
Intangible assets, net	299,458	314,147
Affiliate contract expansion
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	455,305	455,305
Accumulated Amortization and Other	(241,231)	(226,712)
Net	214,074	228,593
FCC Spectrum Licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,659	4,659
Accumulated Amortization and Other	(160)	(97)
Net	4,499	4,562
Acquired subscribers - Cable
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	28,065	28,065
Accumulated Amortization and Other	(25,700)	(25,600)
Net	2,365	2,465
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	463	463
Accumulated Amortization and Other	(257)	(250)
Net	206	213
Cable franchise rights
Finite-Lived Intangible Assets [Line Items]
Total indefinite-lived intangibles	64,334	64,334
FCC Spectrum Licenses
Finite-Lived Intangible Assets [Line Items]
Total indefinite-lived intangibles	13,839	13,839
Railroad crossing rights
Finite-Lived Intangible Assets [Line Items]
Total indefinite-lived intangibles	$ 141	$ 141