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Long-term Debt Issuance (Details)			6 Months Ended
	Jun. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)	Jun. 30, 2011 Chilean Bank Loan [Member] CLP payments	Jun. 30, 2011 Senior Notes Payable 2012 [Member] USD ($)	Dec. 31, 2010 Senior Notes Payable 2012 [Member] USD ($)	Dec. 31, 1997 Senior Notes Payable 2012 [Member] USD ($)	Jun. 30, 2011 Senior Notes Payable 2013 Thru 2018 [Member] USD ($)	Dec. 31, 2010 Senior Notes Payable 2013 Thru 2018 [Member] USD ($)	Dec. 31, 1998 Senior Notes Payable 2013 Thru 2018 [Member] USD ($)	Jun. 30, 2011 Non Recourse Notes Payable 2018 [Member] USD ($)	Dec. 31, 2010 Non Recourse Notes Payable 2018 [Member] USD ($)	Dec. 31, 2003 Non Recourse Notes Payable 2018 [Member] USD ($)	Jun. 30, 2011 Senior Secured Notes Maturing 2017 [Member] USD ($)	Dec. 31, 2010 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		112,000,000	112,000,000		368,700,000	368,700,000		186,400,000	183,500,000
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%
Maximum exposure from debt		41,000,000								41,000,000
Number of Future Semi Annual Payments			16
Principal paid on debt			0
Fair value of debt													$ 255,900,000	$ 263,000,000

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Amount of the total principal payments made during the annual reporting period.

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Amount of long-term debt maturities after year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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