SHARE-BASED COMPENSATION (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted to employees (in shares)	0	0	0		0
Number of shares [Rollforward]
Outstanding, beginning of period (in shares)			145,000
Options exercised (1) (in shares)			(25,000)	[1]
Outstanding, end of period (in shares)	120,000		120,000
Vested, end of period (in shares)	120,000		120,000
Exercisable, end of period (in shares)	120,000		120,000
Exercise Price Range [Rollforward]
Outstanding, beginning of period (in dollars per share)	$ 12.90		$ 12.90			$ 11.91
Options exercised (in dollars per share)			$ 7.14	[1]
Outstanding, end of period (in dollars per share)	$ 12.90		$ 12.90			$ 11.91
Weighted Average Exercise Price [Rollforward]
Outstanding, beginning of period (in dollars per share)	$ 12.90		$ 12.90			$ 11.91
Options exercised (in dollars per share)			$ 7.14	[1]
Outstanding, end of period (in dollars per share)	$ 12.90		$ 12.90			$ 11.91
Vested, end of period (in dollars per share)	$ 12.90		$ 12.90
Exercisable, end of period (in dollars per share)	$ 12.90		$ 12.90
Weighted Average Contractual Life Remaining and Intrinsic Value [Abstract]
Outstanding, Weighted average contractual life			2 years
Vested, Weighted average contractual life			2 years
Exercisable, Weighted average contractual life			2 years
Outstanding, Aggregate Intrinsic Value	$ 3,158,100		$ 3,158,100
Vested, Aggregate Intrinsic Value	3,158,100		3,158,100
Exercisable, Aggregate Intrinsic Value	3,158,100		3,158,100
Total intrinsic value of stock options exercised			683,000
Weighted Average Grant-date Fair Value [Rollforward]
Treasury stock (in shares)	4,740,559		4,740,559			4,692,329
Treasury stock	66,973,000		66,973,000			65,416,000
Options Outstanding [Abstract]
Number of Options Outstanding and Exercisable (in shares)	120,000		120,000
Weighted Average Exercise Price per Share [Abstract]
Options Outstanding and Exercisable Weighted Average Exercise Price per Share (in dollars per share)	$ 12.90		$ 12.90			$ 11.91
Weighted Average Contractual Life Remaining [Abstract]
Options Outstanding and Exercisable Weighted Average Contractual Life Remaining (in years)			2 years
Compensation Expense [Abstract]
Forfeiture rate (in hundredths)	0.00%		0.00%
Total share-based compensation expense	915,000	650,000	1,600,000		1,100,000
Unrecognized compensation expense	5,800,000		5,800,000
Unrecognized compensation expense, period for recognition (in months)			33 months
Period over which employer contribution is vested			4 years
Expenses for the plan	236,000	214,000	465,000		417,000
Range $10.75 - $13.500 [Member]
Number of shares [Rollforward]
Outstanding, end of period (in shares)	80,000		80,000
Exercise Price Range [Rollforward]
Outstanding, beginning of period (in dollars per share)	$ 11.74		$ 11.74
Outstanding, end of period (in dollars per share)	$ 11.74		$ 11.74
Weighted Average Exercise Price [Rollforward]
Outstanding, beginning of period (in dollars per share)	$ 11.74		$ 11.74
Outstanding, end of period (in dollars per share)	$ 11.74		$ 11.74
Weighted Average Contractual Life Remaining and Intrinsic Value [Abstract]
Outstanding, Weighted average contractual life			2 years 6 months
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)			$ 10.75
Range of Exercise Prices, Upper Range Limit (in dollars per share)			$ 13.5
Options Outstanding [Abstract]
Number of Options Outstanding and Exercisable (in shares)	80,000		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		$ 11.74
Weighted Average Contractual Life Remaining [Abstract]
Options Outstanding and Exercisable Weighted Average Contractual Life Remaining (in years)			2 years 6 months
Range $13.51 - $15.25 [Member]
Number of shares [Rollforward]
Outstanding, end of period (in shares)	40,000		40,000
Exercise Price Range [Rollforward]
Outstanding, beginning of period (in dollars per share)	$ 15.23		$ 15.23
Outstanding, end of period (in dollars per share)	$ 15.23		$ 15.23
Weighted Average Exercise Price [Rollforward]
Outstanding, beginning of period (in dollars per share)	$ 15.23		$ 15.23
Outstanding, end of period (in dollars per share)	$ 15.23		$ 15.23
Weighted Average Contractual Life Remaining and Intrinsic Value [Abstract]
Outstanding, Weighted average contractual life			1 year
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		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		$ 15.23
Weighted Average Contractual Life Remaining [Abstract]
Options Outstanding and Exercisable Weighted Average Contractual Life Remaining (in years)			1 year
Range $10.75 - $15.25 [Member]
Number of shares [Rollforward]
Outstanding, end of period (in shares)	120,000		120,000
Exercise Price Range [Rollforward]
Outstanding, beginning of period (in dollars per share)	$ 12.90		$ 12.90
Outstanding, end of period (in dollars per share)	$ 12.90		$ 12.90
Weighted Average Exercise Price [Rollforward]
Outstanding, beginning of period (in dollars per share)	$ 12.90		$ 12.90
Outstanding, end of period (in dollars per share)	$ 12.90		$ 12.90
Weighted Average Contractual Life Remaining and Intrinsic Value [Abstract]
Outstanding, Weighted average contractual life			2 years
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)			$ 10.75
Range of Exercise Prices, Upper Range Limit (in dollars per share)			$ 15.25
Options Outstanding [Abstract]
Number of Options Outstanding and Exercisable (in shares)	120,000		120,000
Weighted Average Exercise Price per Share [Abstract]
Options Outstanding and Exercisable Weighted Average Exercise Price per Share (in dollars per share)	$ 12.90		$ 12.90
Weighted Average Contractual Life Remaining [Abstract]
Options Outstanding and Exercisable Weighted Average Contractual Life Remaining (in years)			2 years
Minimum [Member]
Exercise Price Range [Rollforward]
Outstanding, beginning of period (in dollars per share)	$ 10.75		$ 10.75			$ 7.14
Outstanding, end of period (in dollars per share)	$ 10.75		$ 10.75			$ 7.14
Weighted Average Exercise Price [Rollforward]
Outstanding, beginning of period (in dollars per share)	$ 10.75		$ 10.75			$ 7.14
Outstanding, end of period (in dollars per share)	$ 10.75		$ 10.75			$ 7.14
Weighted Average Exercise Price per Share [Abstract]
Options Outstanding and Exercisable Weighted Average Exercise Price per Share (in dollars per share)	$ 10.75		$ 10.75			$ 7.14
Maximum [Member]
Exercise Price Range [Rollforward]
Outstanding, beginning of period (in dollars per share)	$ 15.25		$ 15.25			$ 15.25
Outstanding, end of period (in dollars per share)	$ 15.25		$ 15.25			$ 15.25
Weighted Average Exercise Price [Rollforward]
Outstanding, beginning of period (in dollars per share)	$ 15.25		$ 15.25			$ 15.25
Outstanding, end of period (in dollars per share)	$ 15.25		$ 15.25			$ 15.25
Weighted Average Exercise Price per Share [Abstract]
Options Outstanding and Exercisable Weighted Average Exercise Price per Share (in dollars per share)	$ 15.25		$ 15.25			$ 15.25
Restricted Stock [Member]
Weighted Average Contractual Life Remaining and Intrinsic Value [Abstract]
Number of restricted shares granted (in shares)			104,421
Number of Shares [Rollforward]
Nonvested (in shares)			276,130
Granted (in shares)			104,421
Vested (in shares)			(102,523)
Forefeited (in shares)			(1,167)
Nonvested (in shares)	276,861		276,861
Weighted Average Grant-date Fair Value [Rollforward]
Nonvested (in dollars per share)			$ 20.75
Granted (in dollars per share)			$ 32.64
Vested (in dollars per share)			$ 11.68
Forefeited (in dollars per share)			$ 20.17
Nonvested (in dollars per share)	$ 25.19		$ 25.19
Treasury stock (in shares)	28,807		28,807
Treasury stock	$ 985,000		$ 985,000
2008 Director LTIP Restricted Stock [Member]
Weighted Average Contractual Life Remaining and Intrinsic Value [Abstract]
Number of restricted shares granted (in shares)			7,831
Number of Shares [Rollforward]
Granted (in shares)			7,831
2008 Employee LTIP Restricted Stock [Member]
Weighted Average Contractual Life Remaining and Intrinsic Value [Abstract]
Number of restricted shares granted (in shares)			96,590
Number of Shares [Rollforward]
Granted (in shares)			96,590

[1] The total intrinsic value of stock options exercised during the six months ended September 30, 2012 was $683 thousand.