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Debt (Tables) | 6 Months Ended
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Jun. 30, 2015
Debt Disclosure [Abstract] |
Schedule of Debt |
| June 30, 2015 | December 31, 2014
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 $2,921 and $3,112, respectively, interest payable semiannually | 247,079 |  | 246,888 |
Total | $ | 254,894 |  | $ | 254,703 |
(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 June 30, 2015 was 0.27%.
Schedule of Line of Credit Facilities | Status of our Iceland revolving credit facility:
| June 30, 2015
Credit Facility maximum amount | $ | 50,000 |
Borrowing availability | 50,000 |
Outstanding borrowings | — |
Status of our U.S. revolving credit facility:
| June 30, 2015
Credit facility maximum amount | $ | 150,000 |
Borrowing availability, net of outstanding letters of credit | 72,617 |
Outstanding borrowings | — |
Letter of credit sub-facility amount | 110,000 |
Outstanding letters of credit issued | 77,383 |
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 | June 30, 2015 | December 31, 2014
E.ON contingent obligation – principal | Other liabilities | $ | (12,902 | ) | $ | (12,902 | )
E.ON contingent obligation – accrued interest | Other liabilities | (5,997 | ) | (5,291 | )
E.ON contingent obligation – derivative asset | Other liabilities | 18,899 |  | 18,193 |
|  | $ | — |  | $ | — |

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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