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Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 41 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]          
Total non-amortizing intangibles $ 78,314 $ 78,314 $ 78,314   $ 64,475
Gross Carrying Amount 488,492 488,492 488,492   496,776
Accumulated Amortization and Other (237,975) (237,975) (237,975)   (195,222)
Net 250,517 250,517 250,517   301,554
Total intangible assets, gross 566,806 566,806 566,806   561,251
Total intangible assets, net 328,831 328,831 328,831 $ 352,201 366,029
Waived management fees under affiliate agreement $ 9,700 29,000 127,400    
Waived management fees under affiliate agreement, expected to be collected   128,200      
Waived management fees under affiliate agreement amount expected to collect monthly   4,200      
Remaining lease term (in years) 20 years        
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 (212,194) (212,194) (212,194)   (167,830)
Net 243,111 243,111 243,111   287,475
FCC spectrum licenses          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 4,659 4,659 4,659   0
Accumulated Amortization and Other (39) (39) (39)   0
Net 4,620 4,620 4,620   0
Finite-lived intangible assets acquired 4,700        
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 (25,499) (25,499) (25,499)   (25,250)
Net 2,566 2,566 2,566   15
Other intangibles          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 463 463 463   463
Accumulated Amortization and Other (243) (243) (243)   (223)
Net 220 220 220   240
Cable franchise rights          
Finite-Lived Intangible Assets [Line Items]          
Total non-amortizing intangibles 64,334 64,334 64,334   64,334
FCC spectrum licenses          
Finite-Lived Intangible Assets [Line Items]          
Total non-amortizing intangibles 13,839 13,839 13,839   0
Indefinite-lived intangible assets acquired 13,800        
Railroad crossing rights          
Finite-Lived Intangible Assets [Line Items]          
Total non-amortizing intangibles $ 141 $ 141 $ 141   $ 141