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Long-Term Debt - Maturities Of Long-Term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 28, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Less than one year | $ 82,306 |  |
One to two years | 160,746 |  |
Two to three years | 8,133 |  |
Three to four years | 133,538 |  |
Four to five years | 8,965 |  |
Over five years | 19,294 |  |
Gross debt | 412,982 |  |
Unamortized debt discounts | (19,224) |  |
Unamortized debt issuance costs | (6,896) |  |
Total debt | 386,862 |  |
Less: current maturities | (82,028) | $ (99,731) |
Long-term debt | 304,834 | 306,122 |
Term Loan Maturing December 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Less than one year | 3,500 |  |
One to two years | 28,000 |  |
Two to three years | 0 |  |
Three to four years | 0 |  |
Four to five years | 0 |  |
Over five years | 0 |  |
Gross debt | 31,500 | 33,250 | $ 35,000
Unamortized debt discounts | 0 |  |
Unamortized debt issuance costs | (286) |  |
Total debt | 31,214 |  |
Less: current maturities | (3,500) |  |
Long-term debt | 27,714 |  |
Convertible Senior Notes Maturing May 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Less than one year | 0 |  |
One to two years | 125,000 |  |
Two to three years | 0 |  |
Three to four years | 0 |  |
Four to five years | 0 |  |
Over five years | 0 |  |
Gross debt | 125,000 | 125,000 |
Unamortized debt discounts | (6,395) | (8,000) |
Unamortized debt issuance costs | (971) |  |
Total debt | 117,634 |  |
Less: current maturities | 0 |  |
Long-term debt | 117,634 |  |
Convertible Senior Notes Maturing September 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Less than one year | 0 |  |
One to two years | 0 |  |
Two to three years | 0 |  |
Three to four years | 125,000 |  |
Four to five years | 0 |  |
Over five years | 0 |  |
Gross debt | 125,000 | 125,000 |
Unamortized debt discounts | (12,829) | (14,500) |
Unamortized debt issuance costs | (2,068) |  |
Total debt | 110,103 |  |
Less: current maturities | 0 |  |
Long-term debt | 110,103 |  |
MARAD Debt Maturing February 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Less than one year | 7,378 |  |
One to two years | 7,746 |  |
Two to three years | 8,133 |  |
Three to four years | 8,538 |  |
Four to five years | 8,965 |  |
Over five years | 19,294 |  |
Gross debt | 60,054 | 63,610 |
Unamortized debt discounts | 0 |  |
Unamortized debt issuance costs | (3,293) |  |
Total debt | 56,761 |  |
Less: current maturities | (7,378) |  |
Long-term debt | 49,383 |  |
Nordea Q5000 Loan Maturing January 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Less than one year | 71,428 |  |
One to two years | 0 |  |
Two to three years | 0 |  |
Three to four years | 0 |  |
Four to five years | 0 |  |
Over five years | 0 |  |
Gross debt | 71,428 | $ 89,286 |
Unamortized debt discounts | 0 |  |
Unamortized debt issuance costs | (278) |  |
Total debt | 71,150 |  |
Less: current maturities | (71,150) |  |
Long-term debt | $ 0 |  |

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