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EQUITY COMPENSATION PLANS AND SHARE-BASED COMPENSATION, Stock Options (Details) (USD $)
3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Additional disclosures [Abstract]        
Total intrinsic value of stock options exercised $ 537,000 $ 994,000 $ 1,000,000 $ 1,900,000
Proceeds from the exercise of stock options 184,000 202,000 261,000 430,000
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Term of grant     10 years  
Unrecognized compensation expense 0   0  
Options, number of shares [Roll Forward]        
Outstanding, beginning of period (in shares)     282,000  
Granted (in shares)     0  
Exercised (in shares)     (36,000)  
Canceled or forfeited (in shares)     0  
Outstanding, end of period (in shares) 246,000   246,000  
Vested and expected to vest, end of period (in shares) 246,000   246,000  
Exercisable (in shares) 246,000   246,000  
Options, average exercise price per share [Roll Forward]        
Outstanding, beginning of period (in dollars per share)     $ 15.21  
Granted (in dollars per share)     $ 0  
Exercised (in dollars per share)     $ 7.39  
Canceled or forfeited (in dollars per share)     $ 0  
Outstanding, end of period (in dollars per share) $ 16.33   $ 16.33  
Vested and expected to vest, end of period (in dollars per share) $ 16.33   $ 16.33  
Exercisable (in dollars per share) $ 16.33   $ 16.33  
Additional disclosures [Abstract]        
Outstanding, average remaining contractual life     1 year 3 months 29 days  
Vested and expected to vest, average remaining contractual life     1 year 3 months 29 days  
Exercisable, average remaining contractual life     1 year 3 months 29 days  
Outstanding, aggregate intrinsic value 4,827,000   4,827,000  
Vested and expected to vest, aggregate intrinsic value 4,827,000   4,827,000  
Exercisable, aggregate intrinsic value $ 4,827,000   $ 4,827,000  
Stock Options [Member] | Employees [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     4 years  
Stock Options [Member] | Non-employee directors [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     1 year