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Debt Credit Facility (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 U.S. revolving credit facility [Member] Long-term Debt [Member] | Jun. 30, 2014 U.S. letter of credit [Member] Long-term Debt [Member] | Jun. 30, 2014 Iceland revolving line of credit [Member] Long-term Debt [Member] | Jun. 30, 2014 Short-term Debt [Member] Iceland revolving line of credit [Member] | Dec. 31, 2013 Short-term Debt [Member] Iceland revolving line of credit [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility term | 5 years |  | 3 years |  |  |  |
Credit facility maximum amount | $ 150,000 |  | $ 50,000 |  |  |  |
Borrowing availability | 79,455 |  | 50,000 |  |  |  |
Outstanding borrowings | 0 |  | 0 | 0 | [1],[2] | 6,000 | [1],[2]
Letter of credit sub-facility amount |  | 80,000 |  |  |  |  |
Outstanding letters of credit issued |  | $ 70,545 |  |  |  |  |
[1] | 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%.
[2] | These items are recorded in accrued and other current liabilities based on the repayment terms and expected maturity.

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- Definition The amount of additional borrowings provided in credit facility under a letter of credit sub-facility. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant