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CONTINGENCIES (Details) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended
Jun. 30, 2012
Dec. 31, 2011
May 31, 2009
Brazilian Tax Authority [Member]
Jun. 30, 2012
Brazilian Tax Authority [Member]
Dec. 31, 2003
Brazilian Tax Authority [Member]
Dec. 31, 2011
Brazilian Tax Authority [Member]
Nov. 30, 2009
Litigation One [Member]
Dec. 31, 2010
Litigation Two [Member]
Jun. 30, 2012
Pending or Threatened Litigation [Member]
Dec. 31, 2011
Pending or Threatened Litigation [Member]
Loss Contingencies [Line Items]                    
Damages being sought     $ 1,530 $ 13,500 $ 4,000   $ 12,400 $ 6,000    
Estimated maximum loss from contingency       28,297   29,726     4,355 4,450
Accrual for loss contingency $ 9,829 $ 10,728   $ 8,840   $ 9,649     $ 989 $ 1,079