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Debt Credit Facility (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding $ 6,000 $ 0
Long-term Debt [Member] | U.S revolving credit facility [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 150,000  
Line of Credit Facility, Amount Outstanding 0  
Borrowing availability, net of outstanding letters of credit 68,081  
Long-term Debt [Member] | U.S. letter of credit [Member]
    
Line of Credit Facility [Line Items]    
Letter of credit sub-facility amount 80,000  
Outstanding letters of credit issued under the revolving credit facility 70,545  
Long-term Debt [Member] | Iceland revolving credit facility [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 50,000  
Borrowing availability, net of outstanding letters of credit 44,000  
U.S revolving credit facility [Member] | Long-term Debt [Member]
    
Line of Credit Facility [Line Items]    
Credit Facility, term 5 years  
Short-term Debt [Member] | Iceland revolving credit facility [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding $ 6,000 [1],[2] $ 0 [1],[2]
Credit Facility, term 3 years  
[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.