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Debt (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Debt Disclosure [Abstract] |  |
Schedule of debt |
| March 31, 2017 | December 31, 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 $2,191 and $2,301, respectively, interest payable semiannually | 247,809 |  | 247,699 |
Total | $ | 255,624 |  | $ | 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 March 31, 2017 was 1.11%.
| December 31,
| 2016 | 2015
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 $2,301 and $2,722, respectively, interest payable semiannually | 247,699 |  | 247,278 |
Total | $ | 255,514 |  | $ | 255,093 |
(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, 2016 was .92%.
Schedule of line of credit facilities | Status of our Iceland revolving credit facility:
| March 31, 2017
Credit facility maximum amount | $ | 50,000 |
Borrowing availability | 50,000 |
Outstanding borrowings | — |
Borrowing availability, net of borrowings | 50,000 |
Status of our U.S. revolving credit facility:
| March 31, 2017
Credit facility maximum amount | $ | 150,000 |
Borrowing availability | 115,288 |
Outstanding letters of credit issued | 65,764 |
Outstanding borrowings | — |
Borrowing availability, net of outstanding letters of credit and borrowings | 49,524 |
| Status of our Iceland revolving credit facility:
| December 31, 2016
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, 2016
Credit facility maximum amount | $ | 150,000 |
Borrowing availability | 96,048 |
Outstanding letters of credit issued | 45,944 |
Outstanding borrowings | — |
Borrowing availability, net of outstanding letters of credit and borrowings | 50,104 |
Debt Instrument Redemption |  | Prior to June 1, 2016, we may redeem the 2021 Notes, in whole or in part, at a redemption price equal to 100% of the principal amount plus a make-whole premium, and if redeemed 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 | Percentage
2017 | 103.750%
2018 | 101.875%
2019 and thereafter | 100.000%
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, 2016 | December 31, 2015
E.ON contingent obligation – principal | Other liabilities | $ | (12,902 | ) | $ | (12,902 | )
E.ON contingent obligation – accrued interest | Other liabilities | (8,113 | ) | (6,702 | )
E.ON contingent obligation – derivative asset | Other liabilities | 21,015 |  | 19,604 |
|  | $ | — |  | $ | — |

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