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Debt - FCC Civil Penalty (Details)
$ in Thousands
1 Months Ended
Jun. 30, 2015
USD ($)
payment
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2014
USD ($)
Debt Instrument [Line Items]        
Principal   $ 258,781    
Total debt, net carrying value   190,646 $ 32,930  
FCC Civil Penalty        
Debt Instrument [Line Items]        
Accrued civil penalty liability       $ 2,000
Notes Payable        
Debt Instrument [Line Items]        
Principal   0 333  
Discount on debt   0 7  
Total debt, net carrying value   $ 0 326  
Notes Payable | FCC Civil Penalty        
Debt Instrument [Line Items]        
Principal $ 2,000   300  
Debt instrument, number of quarterly payments | payment 12      
Debt instrument, stated interest rate 12.75%      
Discount on debt $ 300      
Total debt, net carrying value $ 1,700   $ 300