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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Cash, Cash Equivalents and Restricted Cash      
Restricted cash $ 33,860   $ 33,860
Foreign Currency      
Foreign currency transaction gains (loss) $ (6,438) $ (3,565)  
The 7 1/4% Notes
     
Debt      
Stated interest rate (as a percent) 7.25%   7.25%
6 3/4% Notes
     
Debt      
Stated interest rate (as a percent) 6.75%   6.75%