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Long-Term Debt - Maturities Of Long-Term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Less than one year | $ 70,746 |
One to two years | 8,133 |
Two to three years | 38,538 |
Three to four years | 8,965 |
Four to five years | 209,412 |
Over five years | 9,882 |
Gross debt | 345,676 | $ 404,732
Unamortized debt issuance costs | (9,962) |
Total debt | 335,714 |
Less: current maturities | (70,492) | (90,651)
Long-term debt | 265,222 | 258,912
Term Loan Maturing December 2021 |  |
Debt Instrument [Line Items] |  |
Less than one year | 28,000 |
Gross debt | 28,000 | 29,750
Unamortized debt issuance costs | (95) |
Total debt | 27,905 |
Less: current maturities | (27,905) |
Convertible Senior Notes Maturing May 2022 |  |
Debt Instrument [Line Items] |  |
Less than one year | 35,000 |
Gross debt | 35,000 | 35,000
Unamortized debt issuance costs | (159) |
Total debt | 34,841 |
Less: current maturities | (34,841) |
Convertible Senior Notes Maturing September 2023 |  |
Debt Instrument [Line Items] |  |
Two to three years | 30,000 |
Gross debt | 30,000 | 30,000
Unamortized debt issuance costs | (402) |
Total debt | 29,598 |
Long-term debt | 29,598 |
Convertible Senior Notes Maturing February 2026 |  |
Debt Instrument [Line Items] |  |
Four to five years | 200,000 |
Gross debt | 200,000 | 200,000
Unamortized debt issuance costs | (6,501) |
Total debt | 193,499 |
Long-term debt | 193,499 |
MARAD Debt Maturing February 2027 |  |
Debt Instrument [Line Items] |  |
Less than one year | 7,746 |
One to two years | 8,133 |
Two to three years | 8,538 |
Three to four years | 8,965 |
Four to five years | 9,412 |
Over five years | 9,882 |
Gross debt | 52,676 | $ 56,410
Unamortized debt issuance costs | (2,805) |
Total debt | 49,871 |
Less: current maturities | (7,746) |
Long-term debt | $ 42,125 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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