Prospectus
Supplement No. 4
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Filed
Pursuant to Rule 424(b)(7)
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(to
Prospectus dated August 24, 2007)
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Registration
No. 333-145671
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Name
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Principal
Amount at Maturity of Notes Beneficially Owned
($)
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Percentage
of Notes Beneficially Owned
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Number
of Shares of Common Stock Owned Prior to the Offering(1)
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Number
of Shares of Common Stock That May be Sold(1)
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Percentage
of Common Stock Outstanding(2)
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Argentum
Multi-Strategy Fund, Ltd.(3)
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$130,000
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0.05%
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0
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8,453
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*
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Argent
Classic Convertible Arbitrage Fund Ltd.(4)
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$5,960,000
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2.17%
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0
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387,538
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*
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Argent
LowLev Convertible Arbitrage Fund Ltd.(5)
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$1,130,000
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0.41%
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0
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73,476
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*
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Calyon
S/A(6)
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$3,000,000
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1.09%
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0
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195,069
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*
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Redbrick
Capital Master Fat Tail Fund(7)
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$5,000,000
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1.82%
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0
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325,116
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*
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*
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Less
than 1%
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(1)
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Assumes
conversion of all of the holders notes at a conversion rate of 65.0233
shares per $1,000 principal amount of notes. The conversion
rate for the notes
is subject to adjustment in certain circumstances. As a result,
the number of shares of common stock issuable upon conversion of
the notes
may increase or decrease in the future. See “Description of the
Notes – Conversion of the Notes.”
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(2)
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Calculated
based on Rule 13d-3(d)(1)(i) of the Exchange Act using 123,078,645
shares
of common stock outstanding as of August 22,
2007.
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(3)
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The
Selling Securityholder has indicated that Nathanial Brown and Robert
Richardson have voting control and investment discretion over the
Transfer
Restricted Securities and the full legal name of the Selling
Securityholder through which the Transfer Restricted
Securities are held is Deutsche Bank and Goldman Sachs
International.
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(4)
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The
Selling Securityholder has indicated that Nathanial Brown and Robert
Richardson have voting control and investment discretion
over
the Transfer Restricted Securities and the full legal name of the
Selling
Securityholder through which the Transfer Restricted Securities are
held
is Lehman Brothers International Europe.
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(5)
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The
Selling Securityholder has indicated that Nathanial Brown and Robert
Richardson have voting control and investment discretion
over
the Transfer Restricted Securities and the full legal name of the
Selling
Securityholder through which the Transfer Restricted Securities are
held
is Lehman Brothers International Europe and Morgan Stanley &
Co.
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(6)
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The
Selling Securityholder has indicated that it is an affiliate
of Calyon Securities (USA) Inc. which is a broker-dealer
registered pursuant to Section 15 of the Exchange Act.
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(7)
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The
Selling Securityholder has indicated that Tony Morgan and Jeff Baum,
on
behalf of the Selling Securityholder, have voting control and
investment discretion over the Transfer Restricted
Securities.
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