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SHAREHOLDERS' EQUITY (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2012
Aug. 31, 2011
Dec. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Share Repurchase Program [Abstract]            
Authorized amount of stock repurchase   $ 40,000,000   $ 55,000,000    
Increase to existing share repurchase program 15,000,000          
Share repurchases yet to be purchased under authorization       27,700,000    
Repurchase of common stock (in shares)       0 1,200,000  
Average per share cost including commissions (in dollars per share)         $ 23.41  
Dividend Payments [Abstract]            
Cash dividend declared (in dollars per share)     $ 1 $ 1.00 $ 0 $ 0
Total dividend payout       22,023,000    
Warrants [Member]
           
Class of Warrant or Right [Line Items]            
Intangible asset useful life       10 years    
Common Stock Warrants [Abstract]            
Warrants outstanding (in shares)       30,000 30,000 10,000
Warrants vested (in shares)       14,000 8,000 2,000
Weighted average exercise price (in dollars per share)       $ 3 $ 3 $ 3
Annual vesting percentage (in hundredths)       20.00%    
Warrants term       5 years    
Stock Purchase Rights [Member]
           
Class of Warrant or Right [Line Items]            
Number of preferred stock purchase rights issued for each outstanding share of common stock (in shares)       1    
Number of shares of Series RP Preferred Stock the holder of the Preferred Stock Purchase Right is entitled to (in shares)       0.001    
Series RP Preferred Stock, par value (in dollars per share)       $ 0.001    
Share price (in dollars per share)       $ 24    
Percentage change in ownership that triggers the Preferred Stock Purchase Rights without prior approval of the Board of Directors (in hundredths)       15.00%    
Percentage of discount from market value of common stock under certain set of circumstances (in hundredths)       50.00%    
Cash value of the Preferred Purchase Right unit under certain circumstances (in dollars per share)       $ 0.001    
Number of votes per Preferred Stock Purchase Right       0    
Share Repurchase Program [Member]
           
Share Repurchase Program [Abstract]            
Stock repurchased and retired to date (in shares)       1,200,000 1,200,000  
Stock repurchased and retired to date       $ 27,300,000 $ 27,300,000