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SHARE-BASED COMPENSATION (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 36 Months Ended 9 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Chief financial officer and executive vice president
Dec. 31, 2011
Stock Option
Y
Dec. 31, 2010
Stock Option
Jan. 31, 2012
Stock Option
Chief financial officer and executive vice president
Jan. 11, 2012
Stock Option
Chief financial officer and executive vice president
Dec. 31, 2011
Restricted Stock Unit
Y
Dec. 31, 2010
Restricted Stock Unit
Jan. 31, 2012
Restricted Stock Unit
Chief financial officer and executive vice president
Dec. 31, 2011
Non performance-based restricted stock units
Y
Mar. 31, 2011
Non performance-based restricted stock units
Y
Dec. 31, 2011
Performance-based restricted stock unit activity
Y
Mar. 31, 2011
Performance-based restricted stock unit activity
Y
Dec. 31, 2011
Restricted Stock Units Vesting In Equal Annual Increments Over Four Years
Dec. 31, 2011
Restricted Stock Units Vesting In One Year
Mar. 31, 2014
Restricted stock units vesting based on shareholder return
Mar. 31, 2014
Restricted stock units vesting based on shareholder return
Maximum
Mar. 31, 2014
Restricted stock units vesting based on shareholder return
Minimum
Dec. 31, 2011
Restricted stock units granted as inducement award to the company's chief executive officer
Dec. 31, 2011
Restricted stock units granted as inducement award to the company's chief executive officer
Maximum
Jan. 31, 2012
Performance units
Chief financial officer and executive vice president
Share-based compensation                                          
Share-based compensation expense     $ 0.9 $ 2.1     $ 6.0 $ 7.8                          
Future share-based compensation expense expected     2.8       21.1                            
Period for recognition of unrecognized stock-based compensation expense (in years)     4       4                            
Non-vested restricted stock unit activity                                          
Outstanding at the beginning of the period (in shares)                   1,195,043   586,269                  
Granted (in shares)                 12,390 765,061   302,099   631,967 133,094 172,945     129,154   108,038
Vested (in shares)                   (408,007)   (470,779)                  
Forfeited or cancelled (in shares)                   (245,281)   (122,522)                  
Outstanding at the end of the period (in shares)                   1,306,816 1,195,043 295,067 586,269                
Non-vested restricted stock units, Weighted average fair value per share at grant date                                          
Outstanding at the beginning of the period (in dollars per share)                   $ 13.42   $ 15.26                  
Granted (in dollars per share)                   $ 13.26   $ 11.85                  
Vested (in dollars per share)                   $ 12.86   $ 13.02                  
Forfeited or cancelled (in dollars per share)                   $ 13.34   $ 19.84                  
Outstanding at the end of the period (in dollars per share)                   $ 13.22 $ 13.42 $ 17.06 $ 15.26                
Weighted-average remaining contractual term (in years)                                          
Weighted-average remaining contractual term at the beginning of the period (in years)                   2.23 2.16 2.25 0.51                
Restricted Stock Unit Activity - Other Disclosures                                          
Aggregate fair value of restricted stock units granted                   10.1   3.6                  
Award vesting period (in years)         4 years                 4 years 1 year            
Performance share awards vested (as a percent)                                 200.00% 0.00%   100.00%  
Granted (in shares) 500,576       183,958                                
Granted (in dollars per share) $ 13.74         $ 13.40                              
Term of stock options (in years)         P10Y                                
Increase in non-cash stock compensation expense per quarter   $ 0.2