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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.