Stockholders' Equity (Details) (USD $)	12 Months Ended	70 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Mar. 29, 2007	Dec. 31, 2012 2006 Plan	Dec. 31, 2012 2006 Directors Plan	Dec. 31, 2012 2012 Plan	May 31, 2012 2012 Plan
Stockholder's Equity
Number of shares authorized and reserved for issuance				3,200,000	300,000		5,100,000
Number of shares available for issuance				700,000	100,000	5,100,000
Number of shares of common stock subject to awards that may be granted to each participant					10,000
Share Repurchase Program
Number of shares of outstanding common stock authorized to be acquired under a stock repurchase program	6,600,000	6,600,000	1,000,000
Number of shares of common stock repurchased	300,000	5,900,000
Average price (in dollars per share)	$ 9.97	$ 10.93