CREDIT AGREEMENT (Details) (USD $)	1 Months Ended	12 Months Ended
	May 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Line of Credit Facility [Line Items]
Line of Credit Facility, Initiation Date	May 2011
Line of Credit Facility, Maximum Borrowing Capacity		$ 100,000,000
Potential Increase to Borrowing Capacity		100,000,000
Total Facility Size, Including Potential Increase to Borrowing Capacity		200,000,000
Outstanding Borrowings Under The Line Of Credit		37,000,000	0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.20%
Line of Credit Facility, Expiration Date		May 9, 2014
Minimum Required Liquid Funds		$ 200,000,000
One Month Term		1 month
Three Month Term		3 months
Six Month Term		6 months
Line Of Credit Facility Interest Rate Spread Below The Banks Announced Prime Rate [Member]
Line of Credit Facility [Line Items]
Loans Under The Credit Agreement, Basis Spread on Variable Rate		1.50%
Line Of Credit Facility Interest Rate Spread Above A Daily One Month LIBOR Rate [Member]
Line of Credit Facility [Line Items]
Loans Under The Credit Agreement, Basis Spread on Variable Rate		1.10%
Line Of Credit Facility Interest Rate Spread Above Adjusted LIBOR Rate For A Term Of One Three Or Six Months [Member]
Line of Credit Facility [Line Items]
Loans Under The Credit Agreement, Basis Spread on Variable Rate		1.10%