Common Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Stock Repurchased and Retired During Period, Shares			400,000
Treasury Stock, Value, Acquired, Cost Method			$ 3,491
Retirement of treasury stock	0	0	2,596
Warrants	17,000	17,000
Investment Warrants, Exercise Price	$ 6.29
Minimum [Member]
Class of Stock [Line Items]
Treasury Stock Acquired, Cost Per Share			$ 6.42
Maximum [Member]
Class of Stock [Line Items]
Treasury Stock Acquired, Cost Per Share			$ 11.43
Treasury Stock [Member]
Class of Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method			3,491
Retirement of treasury stock			(3,491)
Accumulated Deficit [Member]
Class of Stock [Line Items]
Retirement of treasury stock			$ 2,596