CREDIT AGREEMENT (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	May 31, 2011	Jun. 30, 2013	May 03, 2013	Mar. 31, 2013
Line of Credit Facility [Line Items]
Line of Credit Facility, Initiation Date	May 09, 2011
Line of Credit Facility, Latest Amendment Date			May 3, 2013
Line of Credit Facility, Maximum Borrowing Capacity		$ 100.0
Potential Increase to Borrowing Capacity		100.0
Total Facility Size, Including Potential Increase to Borrowing Capacity		200.0
Outstanding Borrowings Under The Line Of Credit		0		0
One Month Term		1 month
Three Month Term		3 months
Six Month Term		6 months
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.20%
Line of Credit Facility, Expiration Date		May 09, 2016
Minimum Required Liquid Funds		$ 200.0
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%