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Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 35 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]        
Total non-amortizing intangibles $ 64,475 $ 64,475   $ 64,475
Gross Carrying Amount 483,833 483,833   496,776
Accumulated Amortization and Other (208,594) (208,594)   (195,222)
Net 275,239 275,239   301,554
Total intangible assets, gross 548,308 548,308   561,251
Total intangible assets, net 339,714 339,714 $ 352,201 366,029
Waived management fees under affiliate agreement 9,600 108,000    
Affiliate contract expansion - Wireless        
Finite-Lived Intangible Assets [Line Items]        
Gross Carrying Amount 455,305 455,305   455,305
Accumulated Amortization and Other (183,076) (183,076)   (167,830)
Net 272,229 272,229   287,475
Favorable leases - Wireless        
Finite-Lived Intangible Assets [Line Items]        
Gross Carrying Amount 0 0   15,743
Accumulated Amortization and Other 0 0   (1,919)
Net 0 0   13,824
Acquired subscribers - Cable        
Finite-Lived Intangible Assets [Line Items]        
Gross Carrying Amount 28,065 28,065   25,265
Accumulated Amortization and Other (25,285) (25,285)   (25,250)
Net 2,780 2,780   15
Other intangibles        
Finite-Lived Intangible Assets [Line Items]        
Gross Carrying Amount 463 463   463
Accumulated Amortization and Other (233) (233)   (223)
Net 230 230   240
Cable franchise rights        
Finite-Lived Intangible Assets [Line Items]        
Total non-amortizing intangibles 64,334 64,334   64,334
Railroad crossing rights        
Finite-Lived Intangible Assets [Line Items]        
Total non-amortizing intangibles $ 141 $ 141   $ 141