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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 01, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Non-amortizing intangibles | $ 64,475 | $ 64,475 |  |
Gross carrying amount | 496,776 | 448,988 |  |
Accumulated amortization and other | (195,222) | (132,484) |  |
Total | 301,554 | 316,504 |  | $ 52,000
Total intangible assets, gross carrying amount | 561,251 | 513,463 |  |
Intangible assets, net | 366,029 | 380,979 |  |
Amortization expense | 24,600 | 27,500 | $ 34,900 |
Affiliate contract expansion |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount | 455,305 | 410,157 |  |
Accumulated amortization and other | (167,830) | (105,964) |  |
Total | 287,475 | 304,193 |  | 45,148
Favorable leases - Wireless |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount | 15,743 | 13,103 |  |
Accumulated amortization and other | (1,919) | (1,222) |  |
Total | 13,824 | 11,881 |  | $ 3,665
Acquired subscribers - Cable |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount | 25,265 | 25,265 |  |
Accumulated amortization and other | (25,250) | (25,100) |  |
Total | 15 | 165 |  |
Other intangibles |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount | 463 | 463 |  |
Accumulated amortization and other | (223) | (198) |  |
Total | 240 | 265 |  |
Cable franchise rights |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Non-amortizing intangibles | 64,334 | 64,334 |  |
Railroad crossing rights |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Non-amortizing intangibles | $ 141 | $ 141 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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