Consolidated Statement of Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended
Mar. 31, 2011	Mar. 31, 2010
Consolidated Statement of Shareholders' Equity
Dividends per share (in dollars per share)	$ 0.045	$ 0.045

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

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap
Data Type:	us-types:perShareItemType
Balance Type:	na
Period Type:	duration