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Long-Term Debt - Schedule Of Long-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Aug. 14, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal amount | $ 404,732 |  |
Unamortized debt discounts | (45,692) |  | $ (22,540)
Unamortized debt issuance costs | (9,477) |  | (7,753)
Total debt | 349,563 |  | 405,853
Less current maturities | (90,651) |  | (99,731)
Long-term debt | 258,912 |  | 306,122
Term Loan Maturing December 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 29,750 |  | 33,250
Unamortized debt discounts | 0 |  |
Unamortized debt issuance costs | (191) |  |
Total debt | 29,559 |  |
Less current maturities | (29,559) |  |
Long-term debt | 0 |  |
Convertible Senior Notes Maturing May 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 35,000 |  | 125,000
Unamortized debt discounts | (1,325) |  | (8,000)
Unamortized debt issuance costs | (198) |  |
Total debt | 33,477 |  |
Less current maturities | 0 |  |
Long-term debt | 33,477 |  |
Convertible Senior Notes Maturing September 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 30,000 |  | 125,000
Unamortized debt discounts | (2,651) |  | (14,500)
Unamortized debt issuance costs | (427) |  |
Total debt | 26,922 |  |
Less current maturities | 0 |  |
Long-term debt | 26,922 |  |
Convertible Senior Notes Maturing February 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 200,000 | $ 200,000 | 0
Unamortized debt discounts | (41,716) |  |
Unamortized debt issuance costs | (5,572) |  |
Total debt | 152,712 |  |
Less current maturities | 0 |  |
Long-term debt | 152,712 |  |
MARAD Debt Maturing February 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 56,410 |  | 63,610
Unamortized debt discounts | 0 |  |
Unamortized debt issuance costs | (3,049) |  |
Total debt | 53,361 |  |
Less current maturities | (7,560) |  |
Long-term debt | 45,801 |  |
Nordea Q5000 Loan Maturing January 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 53,572 |  | $ 89,286
Unamortized debt discounts | 0 |  |
Unamortized debt issuance costs | (40) |  |
Total debt | 53,532 |  |
Less current maturities | (53,532) |  |
Long-term debt | $ 0 |  |

X
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