Stockholder Rights Plan (Details) (USD $)	0 Months Ended	12 Months Ended
	Jan. 17, 2012	Dec. 31, 2012 votes	Dec. 31, 2012 Minimum	Dec. 31, 2012 Series A Preferred Stock	Dec. 31, 2011 Series A Preferred Stock
Temporary Equity [Line Items]
Original Rights Agreement, extended term	10 years
Preferred stock, par value (in usd per share)				$ 1.00	$ 1.00
Preferred stock, redemption price (in usd per share)				$ 70,000
Preferred stock, dividend rate (in usd per share)		$ 1.00
Liquidation value per share (in usd per share)		$ 1,000
Preferred stock, number of voting rights		1,000
Distribution date		10 days
Beneficial ownership, percentage			15.00%
Number of preferred stock that can be purchased per right		0.001
Dividends, preferred stock, common share equivalents per share		1,000
Preferred stock, liquidation preference per share of common stock		1,000
Preferred stock, shares authorized				16,000	16,000
Preferred stock, shares issued				0	0
Preferred stock, shares outstanding				0	0
Preferred stock, voting rights, common share equivalent per share		1,000