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Debt (Details) (USD $)
In Thousands, unless otherwise specified

6 Months Ended

12 Months Ended

Jun. 30, 2014

Dec. 31, 2013

Schedule of Debt Instruments [Line Items]

Industrial revenue bonds

$ 7,815

$ 7,815

TOTAL

257,123

262,946

Industrial revenue bonds due 2028 [Member] | Short-term Debt [Member]

Schedule of Debt Instruments [Line Items]

Debt Instrument, Unamortized Discount

0

^[1]

0

^[1]

Debt Instrument, Maturity Date

Apr. 01, 2028

^[1]

Apr. 01, 2028

^[1]

Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum

12.00%

^[1]

12.00%

^[1]

Industrial revenue bonds

7,815

^[1]

7,815

^[1]

Debt Instrument, Interest Rate, Stated Percentage

0.26%

Senior unsecured notes due August 15, 2014 [Member]

Schedule of Debt Instruments [Line Items]

Debt Instrument, Interest Rate, Stated Percentage

7.50%

Senior unsecured notes due August 15, 2014 [Member] | Short-term Debt [Member]

Schedule of Debt Instruments [Line Items]

Debt Instrument, Unamortized Discount

0

0

Debt Instrument, Maturity Date

Aug. 15, 2014

Aug. 15, 2014

Senior unsecured notes, current

2,603

^[2]

2,603

^[2]

Debt Instrument, Interest Rate, Stated Percentage

7.50%

7.50%

Iceland revolving line of credit [Member] | Short-term Debt [Member]

Schedule of Debt Instruments [Line Items]

Revolving credit facility

0

^[2],[3]

6,000

^[2],[3]

Debt Instrument, Interest Rate, Stated Percentage

3.92%

Senior secured notes due June 01, 2021 [Member] | Long-term Debt [Member]

Schedule of Debt Instruments [Line Items]

Debt Instrument, Unamortized Discount

3,295

3,472

Debt Instrument, Maturity Date

Jun. 01, 2021

Jun. 01, 2021

Senior secured notes, noncurrent

$ 246,705

$ 246,528

Debt Instrument, Interest Rate, Stated Percentage

7.50%

7.50%

[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%.

X

- Definition

Carrying value as of the balance sheet date of the long-term debt associated with industrial revenue bonds. For classified balance sheets, these bonds are considered current assets because they are remarketed weekly and the bonds could be required to be repaid upon demand if there is a failed remarketing.

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When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Amount borrowed under the credit facility as of the balance sheet date.

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Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

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