INCOME TAXES (Summary of Income Tax Examinations) (Details)	12 Months Ended
	Dec. 31, 2011
U.S. Federal [Member]
Income Tax Examination [Line Items]
Years under Examination	Short Year Ending December 31, 2007 2008-2010
Additional Open Years	2011
Indonesia [Member]
Income Tax Examination [Line Items]
Years under Examination	2005-2008
Additional Open Years	2009-2011
Peru [Member]
Income Tax Examination [Line Items]
Years under Examination	2007-2008
Additional Open Years	2002-2006, 2009-2011
Chile [Member]
Income Tax Examination [Line Items]
Years under Examination	2010
Additional Open Years	2011
Arizona [Member]
Income Tax Examination [Line Items]
Years under Examination	2003-2007
Additional Open Years	2008-2011
New Mexico [Member]
Income Tax Examination [Line Items]
Years under Examination	0
Additional Open Years	2003-2011