PROSPECTUS SUPPLEMENT NO. 6 |
Filed
Pursuant to Rule 424(b)(7)
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(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) and
prospectus
supplement no. 5 dated October 29,
2007)
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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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Partners
Group Alternative Strategies PCC Ltd (5)
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186,945
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*
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186,945
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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 December 5, 2007
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 39.6071 shares
of our common
shares per $1,000 principal amount of notes and a cash
payment in lieu of
any fractional share, even though we are required to
pay the first $1,000
of exchange value in cash. The exchange rate is subject
to adjustment in
certain events.
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(3)
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Based
on a total of 63,683,641 shares of our common stock outstanding
as of
December 5, 2007.
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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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Nathanial
Brown and Robert Richardson exercise voting and/or dispositive
powers with
respect to these securities.
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