Long-term Debt Narrative (Details)	12 Months Ended						12 Months Ended												12 Months Ended			12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2012 US credit line [Member] USD ($)	Dec. 31, 2012 Canada credit line [Member] USD ($)	Dec. 31, 2012 Letter of Credit [Member] USD ($)	Dec. 31, 2012 Chilean Bank Loan [Member] payments	Dec. 31, 2012 Brazilian Term Credit Facility Maturing 2017 [Member] USD ($) payments	Dec. 31, 2011 Brazilian Term Credit Facility Maturing 2017 [Member] USD ($)	Dec. 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 ($)	Dec. 31, 2012 Senior Notes Payable 2013 Thru 2018 [Member] USD ($)	Dec. 31, 2011 Senior Notes Payable 2013 Thru 2018 [Member] USD ($)	Dec. 31, 2012 Non Recourse Notes Payable 2018 [Member] USD ($)	Dec. 31, 2011 Non Recourse Notes Payable 2018 [Member] USD ($)	Dec. 31, 2012 Senior Secured Notes Maturing 2017 [Member] USD ($)	Dec. 31, 2011 Senior Secured Notes Maturing 2017 [Member] USD ($)	Dec. 31, 2012 Chilian Term Credit Facility Maturing 2019 [Member] USD ($)	Dec. 31, 2012 Chilian Term Credit Facility Maturing 2019 [Member] CLP	Dec. 31, 2011 Chilian Term Credit Facility Maturing 2019 [Member] USD ($)	Dec. 31, 2012 Chilian Term Credit Facility Maturing 2019 [Member] Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Domain]	Dec. 31, 2012 Senior Notes Receivable, due 2012 [Member] USD ($)	Dec. 31, 2011 Senior Notes Receivable, due 2012 [Member] USD ($)	Dec. 31, 2012 Senior Notes 2018 [Member] USD ($)	Dec. 31, 2011 Senior Notes 2018 [Member] USD ($)
Debt Instrument [Line Items]
Foreign Currency Disclosure [Text Block]																			3.2	3.2		1.0
Fair value of debt													$ 113,700,000	$ 122,000,000			$ 397,000,000
Amount of loan issuance												47,900,000	348,600,000		368,700,000				39,000,000	943,543.7391
Notes payable	90,000,000	7,900,000						10,000,000	10,000,000	0	7,900,000		112,000,000	112,000,000	368,700,000	368,700,000	0	189,600,000	39,300,000		40,500,000
Notes, Loans and Financing Receivable, Net	523,600,000	533,500,000																					0	9,900,000		410,000,000
Maturity in 2014	7,600,000												90,000,000
Maturity in 2017	752,300,000												22,000,000
Notes receivable used as collateral on loan													113,700,000												410,000,000
Amount of indebtedness liable for in event of default of notes receivable collateral													10.00%		10.00%
Debt Instrument, Interest Rate, Stated Percentage								6.65%		0.00%					0.00%		13.00%		3.90%	3.90%
Required Debt To Equity Ratio Maximum	1
Long-term Debt	880,500,000	729,100,000
Gains (Losses) on Extinguishment of Debt	(52,200,000)	0	0
Line of Credit Facility, Maximum Borrowing Capacity	100,000,000			60,000,000	10,000,000
Required Fixed Charge Coverage Ratio When Unused Borrowing Capacity Is Below 15 Million	1.1
Excess of Adjusted Borrowing Base	15,000,000
Debt Instrument, Unused Borrowing Capacity, Amount	91,000,000
Minimum Required Percent Of Cash Collateral To Stated Amount Of Letters Of Credit	105.00%
Letters of Credit Outstanding, Amount	9,000,000
Restricted cash	12,000,000	12,900,000				10,000,000
Ratio of Indebtedness to Net Capital	2.5
Required Ebitda to Financial Costs Minimum	3
Number of Future Semi Annual Payments							16	10
Debt, Weighted Average Interest Rate	420.00%	550.00%
Interest Paid, Net	$ 50,100,000	$ 56,600,000	$ 57,000,000