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Long-Term Debt (Tables) | 9 Months Ended
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Sep. 30, 2018
Debt Disclosure [Abstract] |
Scheduled maturities of long-term debt outstanding | Scheduled maturities of our long-term debt outstanding as of September 30, 2018 are as follows (in thousands):
| Term Loan (1) |  | 2022 Notes |  | 2023 Notes |  | MARAD Debt |  | Nordea Q5000 Loan |  | Total
Less than one year | $ | 4,212 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,858 |  |  | $ | 35,714 |  |  | $ | 46,784 |
One to two years | 30,417 |  |  | — |  |  | — |  |  | 7,200 |  |  | 98,214 |  |  | 135,831 |
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 |
Total debt | 34,629 |  |  | 125,000 |  |  | 125,000 |  |  | 70,468 |  |  | 133,928 |  |  | 489,025 |
Current maturities | (4,212 | ) |  | — |  |  | — |  |  | (6,858 | ) |  | (35,714 | ) |  | (46,784 | )
Long-term debt, less current maturities | 30,417 |  |  | 125,000 |  |  | 125,000 |  |  | 63,610 |  |  | 98,214 |  |  | 442,241 |
Unamortized debt discount (2) | — |  |  | (11,772 | ) |  | (18,528 | ) |  | — |  |  | — |  |  | (30,300 | )
Unamortized debt issuance costs (3) | (434 | ) |  | (1,898 | ) |  | (2,986 | ) |  | (4,147 | ) |  | (1,211 | ) |  | (10,676 | )
Long-term debt | $ | 29,983 |  |  | $ | 111,330 |  |  | $ | 103,486 |  |  | $ | 59,463 |  |  | $ | 97,003 |  |  | $ | 401,265 |
(1) | Term Loan borrowing pursuant to the Credit Agreement (as defined below) matures in June 2020. Scheduled principal repayments of the Term Loan have been adjusted to reflect prepayments made in March 2018.
(2) | Our Convertible Senior Notes due 2022 (the “2022 Notes”) will increase to their face amount through accretion of the debt discount through May 2022. Our Convertible Senior Notes due 2023 (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.
Components of net interest expense | The following table details the components of our net interest expense (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Interest expense | $ | 8,171 |  |  | $ | 8,336 |  |  | $ | 24,511 |  |  | $ | 30,183 |
Interest income | (994 | ) |  | (792 | ) |  | (2,263 | ) |  | (2,056 | )
Capitalized interest | (3,928 | ) |  | (3,929 | ) |  | (11,504 | ) |  | (12,647 | )
Net interest expense | $ | 3,249 |  |  | $ | 3,615 |  |  | $ | 10,744 |  |  | $ | 15,480 |

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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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