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Acquisition (Details) - USD ($) $ in Thousands | Feb. 28, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill acquired |  | $ 149,070 | $ 146,497
Big Sandy Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Cash purchase price | $ 10,000 |  |
Property, plant and equipment acquired | 4,600 |  |
Goodwill acquired | 2,600 |  |
Subscriber Relationships | Big Sandy Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Subscriber relationships acquired | $ 2,800 |  |
Estimated useful life, acquired intangible asset | 11 years |  |
Minimum | Big Sandy Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Estimated useful life, acquired property, plant and equipment | 2 years 6 months |  |
Maximum | Big Sandy Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Estimated useful life, acquired property, plant and equipment | 11 years |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + 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=84161108&loc=d3e4845-128472 + Details
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