Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stockholders' Equity Attributable to Parent [Abstract]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			580,600
Stock Repurchased During Period, Shares			174,628
Payments for Repurchase of Common Stock	$ 0	$ 0	$ 1,107