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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2019 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 149,070 | $ 146,497 |
Waived Management Fees Under Affiliate Agreement Amount Expected To Collect Monthly |  |  | 4,200 |  |
Waived management fees, included in affiliate contract expanse accumulated amortization |  |  | 38,800 | 37,800 | $ 36,100
Cumulative waived management fees |  |  | 137,200 |  |
Amortization expense |  |  | 20,500 | $ 24,600 | $ 27,500
Waived Management Fees Under Affiliate Agreement Amount Expected To Collect |  |  | 118,400 |  |
Big sandy acquisition |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Aggregate purchase price | $ 10,000 |  |  |  |
Property, plant and equipment acquired | 4,600 |  |  |  |
Goodwill | 2,600 |  |  |  |
Customer relationships | Big sandy acquisition |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Subscriber relationship acquired | $ 2,800 |  |  |  |
FCC Spectrum Licenses |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Indefinite-lived Intangible Assets Acquired |  | $ 13,800 |  |  |
Finite-lived Intangible Assets Acquired |  | $ 4,700 |  |  |
Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Waived management fees, included in affiliate contract expanse accumulated amortization |  |  | $ 255,600 |  |

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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=118932676&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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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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