v3.20.4

Long-Term Debt - Summary of Debt (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 10, 2016
Debt Instrument [Line Items] |  |  |  |
Unamortized discount and debt issuance costs | $ (11,058) | $ (14,834) |  |
Total long-term debt | 633,942 | 632,406 |  |
Current portion of long-term debt | 2,240 | 0 |  |
Total long-term debt, including current portion | 636,182 | 632,406 |  |
Amortization of deferred financing costs and original issue discount | 4,049 | 3,666 | $ 3,333 |
Level 2 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Estimated fair value of total long-term debt outstanding | 645,700 | 673,800 |  |
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amortization of deferred financing costs and original issue discount | 3,800 | 3,400 | $ 3,100 |
Senior Notes | 9.25% Senior Secured Notes due June 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt, net of current portion, before debt issuance costs and discount | $ 645,000 | 645,000 |  |
Debt instrument, percentage rate | 9.25% |  |  | 9.25%
Unamortized debt discount | $ 16,100 |  |  |
Debt issuance costs | 9,400 |  |  |
Senior Notes | 6.50% Senior Notes due April 2021, net of current portion |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt, net of current portion, before debt issuance costs and discount | 0 | $ 2,240 |  |
Current portion of long-term debt | $ 2,200 |  |  |
Debt instrument, percentage rate | 6.50% |  |  |

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