PROSPECTUS SUPPLEMENT NO.
12
(To Prospectus dated May 10,
2007 as supplemented and amended by
prospectus
supplement no. 1 dated June 13, 2007,
prospectus
supplement no. 2 dated July 17, 2007,
prospectus
supplement no. 3 dated August 24, 2007,
prospectus
supplement no. 4 dated September 27, 2007,
prospectus
supplement no. 5 dated October 29, 2007
prospectus
supplement no. 6 dated December 6, 2007,
prospectus
supplement no. 7 dated April 18, 2008,
prospectus
supplement no. 8 dated May 28, 2008,
prospectus
supplement no. 9 dated July 21, 2008,
prospectus
supplement no. 10 dated November 17, 2008, and
prospectus
supplement no. 11 dated January 14, 2009)
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Filed
Pursuant to Rule 424(b)(7)
Registration
Statement No. 333-142820
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Selling
Shareholder
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Number
of Shares Beneficially Owned Prior to the
Offering(1)(2)
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Percentage
of Shares Beneficially Owned Prior to the
Offering(3)
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Number
of Shares Offered Pursuant
to
this Prospectus
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Number
of Shares Beneficially Owned After the Offering(4)
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Percentage
of Shares Beneficially Owned After the
Offering(3)
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CQS
Convertible and Quantitative Strategies Master Fund Limited.
(5)
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382,160
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*
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382,160
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0
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*
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*
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Less
than one percent.
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(1)
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Based
on information available to us as of April 23, 2009 in Selling Security
Holder Notices and Questionnaires delivered by the selling
shareholders.
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(2)
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The
number of common shares issuable upon the exchange or redemption of the
notes assumes exchange of the full amount of notes held by each selling
shareholder at the initial exchange rate of 47.7692 shares of our common
shares per $1,000 principal amount of notes and a cash payment in lieu of
any fractional share.
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(3)
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Based
on a total of 100,782,598 common
shares outstanding as of April 23, 2009.
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(4)
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Assumes
the selling shareholder sells all of its common shares offered pursuant to
this prospectus.
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(5)
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Dennis
Hunter, Karla Bodden, Jane Flemming, Alan Smith, Jonathan Crowther and
Gary Gladstein, as directors, exercise voting and/or dispositive powers
with respect to these securities.
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