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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

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