Fair Value (Binomial Pricing Model Fair Value Assumption) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 item
Fair Value [Abstract]
Model iterations	100.5
Simulated median price	$ 13.45
Exercise price per share	$ 11.74
Expected volatility	12.03%
Risk free interest rate	0.15%
Yield rate	7.73%