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Debt (Tables)

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

Schedule of Debt



	March 31, 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 $3,017 and $3,112, respectively, interest payable semiannually	246,983			246,888
Total	$	254,798		$	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 March 31, 2015 was 0.22%.

Schedule of Line of Credit Facilities

Status of our Iceland revolving credit facility:



	March 31, 2015
Credit Facility maximum amount	$	50,000
Borrowing availability	50,000
Outstanding borrowings	—

Status of our U.S. revolving credit facility:



	March 31, 2015
Credit facility maximum amount	$	150,000
Borrowing availability, net of outstanding letters of credit	50,617
Outstanding borrowings	—
Letter of credit sub-facility amount (1)	100,000
Outstanding letters of credit issued	99,383


(1)	On December 1, 2014, we entered into an amendment to the U.S. revolving credit facility, increasing our letter of credit sub-facility to $130,000 for the period from December 1, 2014 through March 1, 2015 and to $100,000 thereafter.

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	March 31, 2015			December 31, 2014
E.ON contingent obligation – principal	Other liabilities	$	(12,902	)	$	(12,902	)
E.ON contingent obligation – accrued interest	Other liabilities	(5,644		)	(5,291		)
E.ON contingent obligation – derivative asset	Other liabilities	18,546			18,193
		$	—		$	—