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Debt (Tables)
 6 Months Ended
Jun. 30, 2014
Debt Disclosure [Abstract]  
Schedule of Debt
 
June 30, 2014
December 31, 2013
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

7.5% senior unsecured notes due August 15, 2014, interest payable semiannually (2)
2,603

2,603

Iceland revolving credit facility (2)(3)
—

6,000

Debt classified as non-current liabilities:
 
 
7.5% senior secured notes due June 1, 2021, net of debt discount of $3,295 and $3,472, respectively, interest payable semiannually
246,705

246,528

TOTAL
$
257,123

$
262,946

(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, 2014 was 0.26%.
(2)
These items are recorded in accrued and other current liabilities based on the repayment terms and expected maturity.
(3)
Borrowings under the Iceland revolving credit facility bear variable interest based on LIBOR plus the applicable margin per annum. The interest rate at December 31, 2013 was 3.92%.
Schedule of Line of Credit Facilities
Status of our U.S. revolving credit facility:
 
June 30, 2014
Credit facility maximum amount
$
150,000

Borrowing availability, net of outstanding letters of credit
79,455

Outstanding borrowings
—

Letter of credit sub-facility amount
80,000

Outstanding letters of credit issued
70,545

Status of our Iceland revolving credit facility:
 
June 30, 2014
Credit Facility maximum amount
$
50,000

Borrowing availability
50,000

Outstanding borrowings
—
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, 2014
December 31, 2013
E.ON contingent obligation – principal
Other liabilities
$
(12,902
)
$
(12,902
)
E.ON contingent obligation – accrued interest
Other liabilities
(4,585
)
(3,879
)
E.ON contingent obligation – derivative asset
Other liabilities
17,487

16,781

 
 
$
—

$
—