Condensed Consolidated Statement of Shareholders' Equity (Unaudited) (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Statement of Stockholders' Equity [Abstract]
Dividends declared per share (in dollars per share)	$ 0.08	$ 0.07	$ 0.16	$ 0.140