Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details)

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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 411,081 $ 404,450
Restricted cash 237,325 222,464
Derivative assets 21,050 55,211
Derivative liabilities (27,159) (55,769)
Net assets (liabilities) 642,297  
Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 411,081  
Restricted cash 237,325  
Net assets (liabilities) 648,406  
Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 21,050  
Derivative liabilities (27,159)  
Net assets (liabilities) $ (6,109)