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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Schedule of long-term debt | Long-term debt consists of the following (in thousands):
| December 31,
| 2018 |  | 2017
Term Loan (matures June 2020) | $ | 33,693 |  |  | $ | 97,500 |
2022 Notes (mature May 2022) | 125,000 |  |  | 125,000 |
2023 Notes (mature September 2023) | 125,000 |  |  | — |
2032 Notes (redeemed May 2018) | — |  |  | 60,115 |
MARAD Debt (matures February 2027) | 70,468 |  |  | 77,000 |
Nordea Q5000 Loan (matures April 2020) | 125,000 |  |  | 160,714 |
Unamortized debt discounts | (28,802 | ) |  | (14,406 | )
Unamortized debt issuance costs | (10,044 | ) |  | (10,296 | )
Total debt | 440,315 |  |  | 495,627 |
Less current maturities | (47,252 | ) |  | (109,861 | )
Long-term debt | $ | 393,063 |  |  | $ | 385,766 |
Schedule of maturities of long-term debt outstanding | Scheduled maturities of our long-term debt outstanding as of December 31, 2018 are as follows (in thousands):
| Term Loan (1) |  | 2022 Notes |  | 2023 Notes |  | MARAD Debt |  | Nordea Q5000 Loan |  | Total
Less than one year | $ | 4,680 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,858 |  |  | $ | 35,714 |  |  | $ | 47,252 |
One to two years | 29,013 |  |  | — |  |  | — |  |  | 7,200 |  |  | 89,286 |  |  | 125,499 |
Two to three years | — |  |  | — |  |  | — |  |  | 7,560 |  |  | — |  |  | 7,560 |
Three to four years | — |  |  | 125,000 |  |  | — |  |  | 7,937 |  |  | — |  |  | 132,937 |
Four to five years | — |  |  | — |  |  | 125,000 |  |  | 8,333 |  |  | — |  |  | 133,333 |
Over five years | — |  |  | — |  |  | — |  |  | 32,580 |  |  | — |  |  | 32,580 |
Gross debt | 33,693 |  |  | 125,000 |  |  | 125,000 |  |  | 70,468 |  |  | 125,000 |  |  | 479,161 |
Unamortized debt discounts (2) | — |  |  | (11,043 | ) |  | (17,759 | ) |  | — |  |  | — |  |  | (28,802 | )
Unamortized debt issuance costs (3) | (372 | ) |  | (1,765 | ) |  | (2,862 | ) |  | (4,025 | ) |  | (1,020 | ) |  | (10,044 | )
Total debt | 33,321 |  |  | 112,192 |  |  | 104,379 |  |  | 66,443 |  |  | 123,980 |  |  | 440,315 |
Less current maturities | (4,680 | ) |  | — |  |  | — |  |  | (6,858 | ) |  | (35,714 | ) |  | (47,252 | )
Long-term debt | $ | 28,641 |  |  | $ | 112,192 |  |  | $ | 104,379 |  |  | $ | 59,585 |  |  | $ | 88,266 |  |  | $ | 393,063 |
(1) | Term Loan borrowing pursuant to the Credit Agreement matures in June 2020. Scheduled principal repayments of the Term Loan have been adjusted to reflect prepayments made in March 2018.
(2) | The 2022 Notes will increase to their face amount through accretion of the debt discount through May 2022. The 2023 Notes will increase to their face amount through accretion of the debt discount through September 2023.
(3) | Debt issuance costs are amortized to interest expense over the term of the applicable debt agreement.
Schedule of components of net interest expense | The following table details the components of our net interest expense (in thousands):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Interest expense | $ | 32,617 |  |  | $ | 38,274 |  |  | $ | 45,110 |
Interest income | (3,237 | ) |  | (2,590 | ) |  | (2,086 | )
Capitalized interest | (15,629 | ) |  | (16,906 | ) |  | (11,785 | )
Net interest expense | $ | 13,751 |  |  | $ | 18,778 |  |  | $ | 31,239 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: 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=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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