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Goodwill and Other Intangible Assets - Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Goodwill | $ 2,596,863 | $ 2,579,417
Goodwill, Accumulated Amortization | 0 | 0
Total indefinite-live and amortizable intangible assets | 1,645,035 | 1,361,389
Total indefinite-live and amortizable intangible assets, accumulated amortization | (110,911) | (88,120)
Retransmission agreements |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Amortizable intangible assets | 121,594 | 110,191
Amortizable intangible assets, accumulated amortization | (74,972) | (62,355)
Network affiliation agreements |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Amortizable intangible assets | 110,390 | 43,485
Amortizable intangible assets, accumulated amortization | (27,712) | (19,371)
Other |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Amortizable intangible assets | 28,865 | 15,763
Amortizable intangible assets, accumulated amortization | (8,227) | (6,394)
Television and radio station FCC licenses |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Indefinite-lived intangibles | 1,384,186 | 1,191,950
Total indefinite-live and amortizable intangible assets, accumulated amortization | $ 0 | $ 0

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