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Debt (Tables)
3 Months Ended
Mar. 31, 2016
Debt Disclosure [Abstract]  
Schedule of Debt
 
March 31, 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 $2,620 and $2,722, respectively, interest payable semiannually
247,380

247,278

Total
$
255,195

$
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 March 31, 2016 was 0.59%.
Schedule of Line of Credit Facilities
Status of our Iceland revolving credit facility:
 
March 31, 2016
Credit facility maximum amount
$
50,000

Borrowing availability
45,397

Outstanding borrowings

Borrowing availability, net of borrowings
45,397

Status of our U.S. revolving credit facility:
 
March 31, 2016
Credit facility maximum amount
$
150,000

Borrowing availability
85,844

Outstanding letters of credit issued
44,759

Outstanding borrowings

Borrowing availability, net of outstanding letters of credit and borrowings
41,085