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Summary of Significant Accounting Policies Narrative (Details) $ / shares in Units, shares in Thousands, $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2018 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 hub
Accounting Policies [Line Items] |  |  |  |
Treasury stock (in shares) | shares | 377 |  |  |
Treasury stock (in USD per share) | $ / shares | $ 11.95 |  |  |
Sale of treasury stock | $ | $ 4,500 | $ 0 | $ 4,500 |
Satellite HUBS For HTS Network |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Finance lease term |  |  |  | 5 years
Number of satellite hubs leased | hub |  |  |  | 3

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- Definition Term of lessee's finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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