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

Stockholder's Equity (Schedule Of Dividends Paid And Declared) (Details) (USD $)	1 Months Ended	3 Months Ended						12 Months Ended
	Apr. 20, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Apr. 17, 2012	Dec. 31, 2011
Stockholders' Equity [Abstract]
Dividends paid per share		$ 0.17	$ 0.14	$ 0.13	$ 0.13	$ 0.25		$ 0.65
Dividend declared per share	$ 0.17
Dividend paid and/or declared, per share							$ 0.34