Common stock exercise price per share for each right

$ 80.00

$ 160.00

Percent of outstanding common shares required to exercise purchase rights

15.00%

20.00%

(i) modify the definition of "Beneficial Owner" and "beneficial ownership" of common shares of the Company to include, among other things, certain derivative security interests in common shares of the Company; (ii) reduce the redemption price for the rights to $.001 per right; and (iii) extend the term of the rights agreement by changing the scheduled expiration date from October 18, 2009 to October 17, 2012.

Shareholder Rights Agreement (Details) (USD $)	Oct. 29, 2004 1996 Shareholder Rights Agreement [Member]	Aug. 06, 1996 1996 Shareholder Rights Agreement [Member]	Aug. 09, 2006 2006 Amended Shareholder Rights Agreement [Member]	Aug. 12, 2009 2009 Amended Shareholder Rights Agreement [Member]
Common stock exercise price per share for each right	$ 80.00	$ 160.00
Extended term of rights, in years			3
Percent of outstanding common shares required to exercise purchase rights		15.00%	20.00%
Rights redemption price				$ 0.001
Terms of shareholder rights agreement				(i) modify the definition of "Beneficial Owner" and "beneficial ownership" of common shares of the Company to include, among other things, certain derivative security interests in common shares of the Company; (ii) reduce the redemption price for the rights to $.001 per right; and (iii) extend the term of the rights agreement by changing the scheduled expiration date from October 18, 2009 to October 17, 2012.