Long-Term Debt and Interest Expense - Debt Discounts and Issuance Costs (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Unamortized deferred debt issuance costs	$ 5,300	$ 6,639
Total unamortized discounts and deferred financing costs	23,412	8,795
Senior Notes
Debt Instrument [Line Items]
Unamortized discount	11,616	2,156
Senior Secured Promissory Note
Debt Instrument [Line Items]
Unamortized discount	$ 6,496	$ 0

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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