SUBSEQUENT EVENT (Details) (USD $)	3 Months Ended	6 Months Ended	1 Months Ended
Aug. 11, 2012	Aug. 13, 2011	Aug. 11, 2012	Aug. 13, 2011	Sep. 30, 2012 Dividend declared
SUBSEQUENT EVENT
Dividends declared per common share (in dollars per share)	$ 0.115	$ 0.105	$ 0.23	$ 0.21	$ 0.15
Increase in quarterly dividend declared (as a percent)					30.00%

Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration