SHARE-BASED COMPENSATION (Details) (USD $)	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of restricted shares granted (in shares)	96,942
Number of Shares [Abstract]
Nonvested (in shares)	276,130
Granted (in shares)	96,942
Vested (in shares)	(53,240)
Forefeited (in shares)	(1,167)
Nonvested (in shares)	318,665
Weighted Average Grant-date Fair Value [Abstract]
Nonvested (in dollars per share)	$ 20.75
Granted (in dollars per share)	$ 32.21
Vested (in dollars per share)	$ 33.54
Forefeited (in dollars per share)	$ 20.17
Nonvested (in dollars per share)	$ 22.10
Treasury stock (in shares)	4,800,000		4,692,329
Treasury stock	$ 66,565,000		$ 65,416,000
Compensation Expense [Abstract]
Forfeiture rate (in hundredths)	0.00%
Total share-based compensation expense	663,000	431,000
Unrecognized compensation expense	6,400,000
Unrecognized compensation expense, period for recognition (in months)	36 months
Period over which employer contribution is vested (in years)	4
Expenses for the plan	229,000	203,000
Restricted Stock [Member]
Weighted Average Grant-date Fair Value [Abstract]
Treasury stock (in shares)	17,198
Treasury stock	577,000
Stock Options [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Total intrinsic value of stock options exercised	$ 3,000,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted to employees	0	0
2008 Director LTIP Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of restricted shares granted (in shares)	352
Number of Shares [Abstract]
Granted (in shares)	352
2008 Employee LTIP Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of restricted shares granted (in shares)	96,590
Number of Shares [Abstract]
Granted (in shares)	96,590
Range $7.14 - $9.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit (in dollars per share)	$ 7.14
Range of Exercise Prices, Upper Range Limit (in dollars per share)	$ 9.00
Options Outstanding [Abstract]
Number of Options Outstanding and Exercisable (in shares)	25,000
Weighted Average Exercise Price per Share [Abstract]
Options Outstanding and Exercisable Weighted Average Exercise Price per Share (in dollars per share)	$ 7.14
Weighted Average Contractual Life Remaining [Abstract]
Options Outstanding and Exercisable Weighted Average Contractual Life Remaining (in years)	1 year
Range $9.01-$13.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit (in dollars per share)	$ 9.01
Range of Exercise Prices, Upper Range Limit (in dollars per share)	$ 13.50
Options Outstanding [Abstract]
Number of Options Outstanding and Exercisable (in shares)	80,000
Weighted Average Exercise Price per Share [Abstract]
Options Outstanding and Exercisable Weighted Average Exercise Price per Share (in dollars per share)	$ 11.74
Weighted Average Contractual Life Remaining [Abstract]
Options Outstanding and Exercisable Weighted Average Contractual Life Remaining (in years)	3 years
Range $13.51-$15.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit (in dollars per share)	$ 13.51
Range of Exercise Prices, Upper Range Limit (in dollars per share)	$ 15.25
Options Outstanding [Abstract]
Number of Options Outstanding and Exercisable (in shares)	40,000
Weighted Average Exercise Price per Share [Abstract]
Options Outstanding and Exercisable Weighted Average Exercise Price per Share (in dollars per share)	$ 15.23
Weighted Average Contractual Life Remaining [Abstract]
Options Outstanding and Exercisable Weighted Average Contractual Life Remaining (in years)	1 year 6 months
Range $7.14-$15.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit (in dollars per share)	$ 7.14
Range of Exercise Prices, Upper Range Limit (in dollars per share)	$ 15.25
Options Outstanding [Abstract]
Number of Options Outstanding and Exercisable (in shares)	145,000
Weighted Average Exercise Price per Share [Abstract]
Options Outstanding and Exercisable Weighted Average Exercise Price per Share (in dollars per share)	$ 11.91
Weighted Average Contractual Life Remaining [Abstract]
Options Outstanding and Exercisable Weighted Average Contractual Life Remaining (in years)	2 years 2 months 12 days