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Fair Value Measurements - Narrative (Details)
shares in Millions, $ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2017
shares
Jun. 30, 2015
USD ($)
Apr. 30, 2015
USD ($)
Sep. 30, 2017
contract
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2013
Fair Value Measurements [Line Items]            
Settlement amount         $ 0.4  
Stock issued for settlement (in shares) | shares 0.3       1.3  
Stock issuance settlement period       40 days    
8.00% Convertible Senior Notes Issued in 2013            
Fair Value Measurements [Line Items]            
Loan interest rate       8.00%   8.00%
(Level 3)            
Fair Value Measurements [Line Items]            
Number of derivatives (in contracts) | contract       2    
Hughes Network Systems LLC            
Fair Value Measurements [Line Items]            
Fair value of common stock issued to vendor for payment of invoices   $ 15.5 $ 15.5