Rights Plan and Series A Junior Participating Preferred Stock (Narrative) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Sep. 10, 2002
Rights Plan and Series A Junior Participating Preferred Stock [Abstract]
Preferred stock, shares designated as Series A Junior Participating Preferred Stock (in shares)	700,000	700,000	700,000
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000	5,000,000
Preferred stock, par value per share (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Per share price for registered holders (in dollars per share)			$ 9.00