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

Fair Value Measurements (Carrying Amounts And Fair Values Of Financial Instruments) (Details)

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Fair Value Measurements (Carrying Amounts And Fair Values Of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Fair Value Measurements [Abstract]        
Restricted cash, Book value $ 237,325 $ 222,464    
Derivative assets, Book value 21,050 55,211    
Cash and cash equivalents, Book value 411,081 404,450 [1],[2] 182,617 [1],[2] 193,563
Assets, Book value 669,456 682,125    
Debt, Book value 6,111,165 [3] 6,566,163    
Derivative liabilities, Book value 27,159 55,769    
Liabilities, Book value 6,138,324 6,621,932    
Restricted cash, Fair value 237,325 222,464    
Derivative assets, Fair value 21,050 55,211    
Cash and cash equivalents, Fair value 411,081 404,450    
Assets, Fair value 669,456 682,125    
Debt, Fair value 5,710,399 6,177,381    
Derivative liabilities, Fair value 27,159 55,769    
Liabilities, Fair value $ 5,737,558 $ 6,233,150    
[1] Includes the results of Genesis for the period from March 25, 2010 (date of acquisition) to December 31, 2010 and the issue of shares to Genesis and Waha.
[2] The Amalgamation gain, net of transaction expenses of $274, as presented in the consolidated income statement, consists of the Amalgamation gain of $31,023, as presented in the consolidated statement of cash flow and transaction expenses of $30,749 (Note 1).
[3] As of December 31, 2011, we remain in compliance with the respective financial covenants across the Company's various debt obligations.