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Financial Instruments - Balance Sheet Location (Table) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Derivatives Fair Value [Line Items]    
Financial instruments long-term liabilities. $ 0 $ 4,422
Financial instruments short-term liabilities 1,389 8,255
Total Derivatives 1,389 12,677
Derivatives designated as hedging instruments - effective hedges
    
Derivatives Fair Value [Line Items]    
Financial instruments long-term liabilities. 0 4,422
Financial instruments short-term liabilities 296 839
Total derivatives not designated as hedging instruments - ineffective hedges
    
Derivatives Fair Value [Line Items]    
Financial instruments short-term liabilities $ 1,093 $ 7,416