Stockholders' Equity - Schedule of Dividends Paid and Declared (Details) (USD $)	3 Months Ended							12 Months Ended	0 Months Ended	9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2011	Oct. 10, 2012 Subsequent Event [Member]	Oct. 10, 2012 Subsequent Event [Member]
Stockholders' Equity Note [Abstract]
Dividends paid per share	$ 0.19	$ 0.17	$ 0.17	$ 0.14	$ 0.13	$ 0.13	$ 0.25	$ 0.65
Subsequent Event [Line Items]
Dividend declared per share									$ 0.21
Dividend paid and/or declared, per share										$ 0.74