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| Prospectus Supplement No. 2            |   | Filed Pursuant to Rule 424(b)(7) |
|                                   |   |   |
| (To Prospectus dated December 3, 2013) |   |  Registration No. 333-192510 |

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| • | the name of each Selling Securityholder; |

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| • | the number of shares of our common stock issued upon exercise that may be sold by the Selling Securityholders; and |

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|---------|-----------------------------------------------------------------------------------------------------------------------------------------|
| • | the number and percent of shares of common stock to be beneficially owned by each Selling Securityholder before and after the offering. |

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| Name                                   | Number of Warrants Beneficially Owned Prior to Offering | Number of Warrants that may be Offered Hereby | Percentage of Outstanding Warrants | Shares of Common Stock Beneficially owned Prior to Offering | Shares of Common Stock Beneficially Owned After Offering |
| Number (1)                             | Percent (2) | Number | Percent (2) |
| Credit Suisse Securities (USA) LLC (3) | — | — | — | 194,706 | * | — | — |
| *Less than 1%                          |   |   |   |   |   |   |   |   |   |   |   |   |

|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
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| (1) | Includes that whole number of shares of our common stock resulting from the previous exercise of the Warrants owned and any other shares of our common stock owned as well as that number of shares of our common stock underlying shares of our 6.50% Series A Convertible Perpetual Preferred Stock and our 2.00% Convertible Senior Subordinated Notes, each of which are convertible at the option of the holder into shares of our common stock pursuant to the terms of the Certificate of Designations and the Indenture establishing such series of securities, respectively, and deemed to be outstanding pursuant to Rule 13d-3(d)(1) under the Exchange Act. Assumes all shares of Series A Preferred Stock and 2.00% Convertible Notes are converted into shares of our common stock. Pursuant to the Certificate of Designations for Series A Preferred Stock and the Indenture for 2.00% Convertible Notes, we may elect to satisfy the conversion obligation with cash or a combination of cash and shares of our common stock. |

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| (2) | This percentage is calculated using as the numerator the number of shares of common stock included in the previous column and as the denominator 87,798,168 shares of common stock issued and outstanding, net of treasury shares, on January 13, 2014, plus the number of shares of common stock underlying our convertible securities owned by such holder. |

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| (3) | This selling securityholder exercised its Warrants on January 16, 2014. The natural person who has voting and dispositive power for these shares is Michael A. Meyers, Managing Director of Credit Suisse Securities (USA) LLC. Mr. Meyers disclaims beneficial ownership of the shares except for his pecuniary interest. Credit Suisse Securities (USA) LLC has indicated to the issuer that it is a broker-dealer and, accordingly, a statutory underwriter. Credit Suisse Securities (USA) LLC has indicated to the issuer that it did not receive the securities as compensation for investment banking services and the securities were acquired in the ordinary course of business, and that at the time of the acquisition of securities, Credit Suisse Securities (USA) LLC had no agreements or understandings, directly or indirectly, with any party to distribute the securities. |