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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