CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (USD $)	1 Months Ended	12 Months Ended
Feb. 28, 2013	Jul. 31, 2012	Feb. 29, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF EQUITY
Cash dividends per share (in dollars per share)	$ 0.30	$ 0.25	$ 0.15	$ 0.80	$ 0.48	$ 0.40

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

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