Debt (Tables)

6 Months Ended

Jun. 30, 2016

Debt Disclosure [Abstract]

Schedule of Debt

	June 30, 2016		December 31, 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 $2,516 and $2,722, respectively, interest payable semiannually	247,484		247,278
Total	$	255,299	$	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 June 30, 2016 was 0.61%.

Schedule of Line of Credit Facilities

Status of our U.S. revolving credit facility:

	June 30, 2016
Credit facility maximum amount	$	150,000
Borrowing availability	93,037
Outstanding letters of credit issued	54,005
Outstanding borrowings	—
Borrowing availability, net of outstanding letters of credit and borrowings	39,032

Status of our Iceland revolving credit facility:

	June 30, 2016
Credit facility maximum amount	$	50,000
Borrowing availability	50,000
Outstanding borrowings	—
Borrowing availability, net of borrowings	50,000