Stock Incentive Plans (Details 3) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary of assumptions used for valuation of equity instruments granted
Quarterly dividend per share	$ 0.050	$ 0.215	$ 0.150	$ 0.645
Restricted Stock [Member]
Summary of assumptions used for valuation of equity instruments granted
Quarterly dividend per share			$ 0.05	$ 0.215
Restricted Stock [Member] | Maximum [Member]
Summary of assumptions used for valuation of equity instruments granted
Risk free rate Maximum			0.21%	8.48%
Restricted Stock [Member] | Minimum [Member]
Summary of assumptions used for valuation of equity instruments granted
Risk free rate Minimum			0.18%	0.00%