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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Schedule of debt | 5. Debt
| December 31,
| 2017 |  | 2016
Debt classified as current liabilities: |  |  |
Hancock County industrial revenue bonds ("IRBs") due 2028, interest payable quarterly (variable interest rates (not to exceed 12%)) (1) | $ | 7,815 |  |  | $ | 7,815 |
Debt classified as non-current liabilities: |  |  |  |
7.5% senior secured notes due June 1, 2021, net of debt discount of $1,847 and $2,301, respectively, interest payable semiannually | 248,153 |  |  | 247,699 |
Total | $ | 255,968 |  |  | $ | 255,514 |
(1) | The IRBs are classified as current liabilities because they are remarketed weekly and could be required to be repaid upon demand if there is a failed remarketing. The IRB interest rate at December 31,
Schedule of line of credit facilities | Status of our Iceland revolving credit facility:
| December 31, 2017
Credit facility maximum amount | $ | 50,000 |
Borrowing availability | 50,000 |
Outstanding letters of credit issued | — |
Outstanding borrowings | — |
Borrowing availability, net of outstanding letters of credit and borrowings | $ | 50,000 |
Status of our U.S. revolving credit facility:
| December 31, 2017
Credit facility maximum amount | $ | 150,000 |
Borrowing availability | 147,706 |
Outstanding letters of credit issued | 37,857 |
Outstanding borrowings | — |
Borrowing availability, net of outstanding letters of credit and borrowings | $ | 109,849 |
Schedule of debt instrument redemption | We may redeem the 2021 Notes, in whole or in part, during the twelve-month period beginning on June 1 of the years indicated below, at the following redemption prices plus accrued and unpaid interest:
Year - Redemption rights |  | Percentage
2018 |  | 101.875%
2019 and thereafter |  | 100.000%
Schedule of offsetting of financial instruments and derivatives | The following table provides information about the balance sheet location and gross amounts offset:
Offsetting of financial instruments and derivatives |  | Balance sheet location |  | December 31, 2017 |  | December 31, 2016
Contingent obligation – principal |  | Other liabilities |  | $ | (12,902 | ) |  | $ | (12,902 | )
Contingent obligation – accrued interest |  | Other liabilities |  | (9,524 | ) |  | (8,113 | )
Contingent obligation – derivative asset |  | Other liabilities |  | 22,426 |  |  | 21,015 |
|  |  |  | $ | — |  |  | $ | — |

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