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COMMON STOCK AND STOCK INCENTIVE PLANS (Details 2) (USD $)
 1 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2010
Senior executive officers
Aug. 31, 2011
Top performers at (senior) directors level and key talent below director level
Dec. 31, 2012
Stock options
Dec. 31, 2011
Stock options
Dec. 31, 2010
Stock options
Aug. 31, 2011
Stock options
Board members
Dec. 31, 2012
Stock options
Board members
Sep. 30, 2012
Stock options
Board members
Dec. 31, 2012
Restricted stock units
Senior executive officers
Mar. 31, 2011
Restricted stock units
Senior executive officers
Aug. 31, 2011
Restricted stock units
Board members
Aug. 31, 2011
Restricted stock units
Top performers at (senior) directors level and key talent below director level
Dec. 31, 2011
Restricted stock units
Management and employees
Dec. 31, 2012
Performance-based restricted stock units
Mar. 31, 2011
Performance-based restricted stock units
Senior executive officers
Aug. 31, 2011
Performance-based restricted stock units
Top performers at (senior) directors level and key talent below director level
Dec. 31, 2012
Restricted stock awards
Dec. 31, 2011
Restricted stock awards
Dec. 31, 2010
Restricted stock awards
Dec. 31, 2012
Restricted stock awards
Senior executive officers
Sep. 30, 2012
Restricted stock awards
Board members
Dec. 31, 2011
Restricted stock awards
Management and employees
COMMON STOCK AND STOCK INCENTIVE PLANS                                            
Vesting period   4 years             4 years 4 years                   4 years    
Number of shares outstanding                                            
Options Outstanding at the beginning of the period (in shares)     1,127,000 1,388,000 1,917,000                                  
Options Granted (in shares)     246,000 486,000 218,000 77,805 26,666 36,488                            
Options Exercised (in shares)       (20,000) (1,000)                                  
Options Forfeited or Expired (in shares)     (443,000) (728,000) (746,000)                                  
Options Outstanding at the end of the period (in shares)     930,000 1,127,000 1,388,000                                  
Weighted average exercise price                                            
Options Outstanding at the beginning of the period (in dollars per share)     $ 23.52 $ 15.06 $ 26.94                                  
Options Granted (in dollars per share)     $ 3.24 $ 36.78 $ 6.51 $ 1.39 $ 2.97 $ 3.21                            
Options Exercised (in dollars per share)       $ 6.27 $ 8.46                                  
Options Forfeited or Expired (in dollars per share)     $ 19.56 $ 16.71 $ 43.05                                  
Options Outstanding at the end of the period (in dollars per share)     $ 20.04 $ 23.52 $ 15.06                                  
Stock-based awards                                            
Number of ordinary shares available for issuance pursuant to future grants 0                                          
Ratio for grant of stock awards that is deducted from the shares available for grant                                 1          
Number of remaining awards earned (in shares)                                 701,000 300,000 1,100,000      
Shares                                            
Total nonvested at the beginning of the period (in shares)                                 902,000          
Granted (in shares)                 566,666 89,333 51,138 74,000 144,167 0 134,000 74,000 1,900,000 800,000 500,000 566,666 36,488 200,000
Vested (in shares)                                 (701,000) (300,000) (1,100,000)      
Forfeited (in shares)                                 (390,000)          
Total nonvested at the end of the period (in shares)                                 1,702,000 902,000        
Weighted average grant date fair value                                            
Total nonvested at the beginning of the period (in dollars per share)                                 $ 5.87          
Granted (in dollars per share)                                 $ 3.29 $ 5.58 $ 6.75   $ 3.21  
Vested (in dollars per share)                                 $ 5.60          
Forfeited (in dollars per share)                                 $ 4.49          
Total nonvested at the end of the period (in dollars per share)                                 $ 3.43 $ 5.87