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Long-term Debt Issuance (Details)
 3 Months Ended
Mar. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Mar. 31, 2012
Chilean Bank Loan [Member]
CLP
payments
Mar. 31, 2012
Brazilian Term Credit Facility Maturing 2017 [Member]
USD ($)
payments
Dec. 31, 2011
Brazilian Term Credit Facility Maturing 2017 [Member]
USD ($)
Mar. 31, 2012
Senior Notes Payable 2012 [Member]
USD ($)
Dec. 31, 2011
Senior Notes Payable 2012 [Member]
USD ($)
Dec. 31, 1997
Senior Notes Payable 2012 [Member]
USD ($)
Mar. 31, 2012
Senior Notes Payable 2013 Thru 2018 [Member]
USD ($)
Dec. 31, 2011
Senior Notes Payable 2013 Thru 2018 [Member]
USD ($)
Dec. 31, 1998
Senior Notes Payable 2013 Thru 2018 [Member]
USD ($)
Mar. 31, 2012
Non Recourse Notes Payable 2018 [Member]
USD ($)
Dec. 31, 2011
Non Recourse Notes Payable 2018 [Member]
USD ($)
Dec. 31, 2003
Non Recourse Notes Payable 2018 [Member]
USD ($)
Mar. 31, 2012
Senior Secured Notes Maturing 2017 [Member]
USD ($)
Dec. 31, 2011
Senior Secured Notes Maturing 2017 [Member]
USD ($)
Debt Instrument [Line Items]                                
Amount of loan issuance               $ 47,900,000     $ 348,600,000     $ 368,700,000    
Notes Payable 7,900,000 7,900,000   10,000,000 10,000,000 7,900,000 7,900,000   112,000,000 112,000,000   368,700,000 368,700,000   191,200,000 189,600,000
Maturity in 2013                 90,000,000              
Maturity in 2018                 22,000,000              
Notes receivable used as collateral on loan 9,900,000               113,700,000     410,000,000        
Amount of indebtedness liable for in event of default of notes receivable collateral                 10.00%     10.00%        
Number of Future Semi Annual Payments     16 10                        
Principal paid on debt     0                          
Fair value of debt                             $ 236,000,000 $ 243,000,000