Common and preferred stock	6 Months Ended
Jun. 30, 2013
Common and preferred stock	7. Common and preferred stock The Company is authorized to issue 550,000,000 shares of common stock, par value $0.01 per share, and 10,000,000 shares of undesignated preferred stock, par value $0.01 per share, issuable in one or more series designated by the Company’s board of directors. No other class of capital stock is authorized. As of June 30, 2013 and December 31, 2012, 300,869,683 and 286,035,082 shares of common stock, respectively, were issued and outstanding and no shares of preferred stock were outstanding. Included in the common stock outstanding as of June 30, 2013 and December 31, 2012 are 9,000,000 shares of common stock loaned to Bank of America under a share lending agreement in connection with the offering of the $100.0 million aggregate principal amount of 2015 notes (see Note 10 — Senior convertible notes). Bank of America is obligated to return the borrowed shares (or, in certain circumstances, the cash value thereof) to the Company on or about the 45th business day following the date as of which the entire principal amount of the notes ceases to be outstanding, subject to extension or acceleration in certain circumstances or early termination at Bank of America’s option. The Company did not receive any proceeds from the sale of the borrowed shares by Bank of America, but the Company did receive a nominal lending fee of $0.01 per share from Bank of America for the use of borrowed shares. In February 2012, the Company sold in an underwritten public offering 35,937,500 units at an aggregate price to the public of $86.3 million, with each unit consisting of one share of common stock and a warrant to purchase 0.6 of a share of common stock. Net proceeds from this offering were approximately $80.6 million, excluding any future proceeds from the exercise of warrants. The warrants are exercisable at $2.40 per share and expire in February 2016. Concurrent with this public offering, pursuant to The Mann Group Common Stock Purchase Agreement entered into in February 2012, The Mann Group agreed to purchase $77.2 million worth of restricted shares or 31,250,000 restricted shares of common stock at an aggregate purchase price of $77.2 million, which were issued in June 2012 in exchange for cancellation of principal indebtedness of $77.2 million under the revolving amended and restated loan arrangement (see Note 9 — Related-party arrangements). In October 2012, the Company sold in an underwritten public offering 46,000,000 units at an aggregate price to the public of $92.0 million, with each unit consisting of one share of common stock and a warrant to purchase 0.75 of a share of common stock. Net proceeds from this offering were approximately $86.3 million, excluding any future proceeds from the exercise of warrants. The warrants are exercisable at $2.60 per share and expire in the fourth quarter of 2013. As of June 30, 2013, we have received $25.1 million in proceeds from the exercise of a portion of such warrants with $64.6 million remaining unexercised. Concurrent with this public offering, pursuant to a Common Stock and Warrant Purchase Agreement with The Mann Group entered into in October 2012 (the “Mann Group Common Stock and Warrant Purchase Agreement”), The Mann Group agreed to purchase for an aggregate purchase price of $107.4 million, 40,000,000 restricted shares of common stock and warrants to purchase 30,000,000 restricted shares of common stock, which were issued in October 2012 in exchange for cancellation of principal indebtedness of $107.4 million under the revolving amended and restated loan arrangement (see Note 9 — Related-party arrangements). The Mann Group warrants are exercisable at $2.60 per share and expire in the fourth quarter of 2013. As of June 30, 2013, The Mann Group warrants remained unexercised. In connection with both the February and October 2012 public offerings, the Company performed an analysis of the warrants to determine their appropriate classification and concluded that in both instances the warrants should be classified within equity. In connection with The Mann Group Common Stock Purchase Agreement the Company concluded that this agreement represented a contingent forward contract that met the definition of a derivative instrument in accordance with ASC 815 Derivatives and Hedging, and that a portion of the restricted common stock issued should be classified as equity and the remaining portion should be classified as assets or liabilities accounted for at fair value. In connection with The Mann Group Common Stock and Warrant Purchase Agreement, the Company concluded that this agreement represented a contingent forward contract and that the restricted common stock and warrants issued to The Mann Group should be classified as assets or liabilities accounted for at fair value. Both the February and October forward contracts settled during 2012.

7. Common and preferred stock

The Company is authorized to issue 550,000,000 shares of common stock, par value $0.01 per share, and 10,000,000 shares of undesignated preferred stock, par value $0.01 per share, issuable in one or more series designated by the Company’s board of directors. No other class of capital stock is authorized. As of June 30, 2013 and December 31, 2012, 300,869,683 and 286,035,082 shares of common stock, respectively, were issued and outstanding and no shares of preferred stock were outstanding. Included in the common stock outstanding as of June 30, 2013 and December 31, 2012 are 9,000,000 shares of common stock loaned to Bank of America under a share lending agreement in connection with the offering of the $100.0 million aggregate principal amount of 2015 notes (see Note 10 — Senior convertible notes). Bank of America is obligated to return the borrowed shares (or, in certain circumstances, the cash value thereof) to the Company on or about the 45th business day following the date as of which the entire principal amount of the notes ceases to be outstanding, subject to extension or acceleration in certain circumstances or early termination at Bank of America’s option. The Company did not receive any proceeds from the sale of the borrowed shares by Bank of America, but the Company did receive a nominal lending fee of $0.01 per share from Bank of America for the use of borrowed shares.

In February 2012, the Company sold in an underwritten public offering 35,937,500 units at an aggregate price to the public of $86.3 million, with each unit consisting of one share of common stock and a warrant to purchase 0.6 of a share of common stock. Net proceeds from this offering were approximately $80.6 million, excluding any future proceeds from the exercise of warrants. The warrants are exercisable at $2.40 per share and expire in February 2016. Concurrent with this public offering, pursuant to The Mann Group Common Stock Purchase Agreement entered into in February 2012, The Mann Group agreed to purchase $77.2 million worth of restricted shares or 31,250,000 restricted shares of common stock at an aggregate purchase price of $77.2 million, which were issued in June 2012 in exchange for cancellation of principal indebtedness of $77.2 million under the revolving amended and restated loan arrangement (see Note 9 — Related-party arrangements).

In October 2012, the Company sold in an underwritten public offering 46,000,000 units at an aggregate price to the public of $92.0 million, with each unit consisting of one share of common stock and a warrant to purchase 0.75 of a share of common stock. Net proceeds from this offering were approximately $86.3 million, excluding any future proceeds from the exercise of warrants. The warrants are exercisable at $2.60 per share and expire in the fourth quarter of 2013. As of June 30, 2013, we have received $25.1 million in proceeds from the exercise of a portion of such warrants with $64.6 million remaining unexercised. Concurrent with this public offering, pursuant to a Common Stock and Warrant Purchase Agreement with The Mann Group entered into in October 2012 (the “Mann Group Common Stock and Warrant Purchase Agreement”), The Mann Group agreed to purchase for an aggregate purchase price of $107.4 million, 40,000,000 restricted shares of common stock and warrants to purchase 30,000,000 restricted shares of common stock, which were issued in October 2012 in exchange for cancellation of principal indebtedness of $107.4 million under the revolving amended and restated loan arrangement (see Note 9 — Related-party arrangements). The Mann Group warrants are exercisable at $2.60 per share and expire in the fourth quarter of 2013. As of June 30, 2013, The Mann Group warrants remained unexercised.

In connection with both the February and October 2012 public offerings, the Company performed an analysis of the warrants to determine their appropriate classification and concluded that in both instances the warrants should be classified within equity. In connection with The Mann Group Common Stock Purchase Agreement the Company concluded that this agreement represented a contingent forward contract that met the definition of a derivative instrument in accordance with ASC 815 Derivatives and Hedging, and that a portion of the restricted common stock issued should be classified as equity and the remaining portion should be classified as assets or liabilities accounted for at fair value. In connection with The Mann Group Common Stock and Warrant Purchase Agreement, the Company concluded that this agreement represented a contingent forward contract and that the restricted common stock and warrants issued to The Mann Group should be classified as assets or liabilities accounted for at fair value. Both the February and October forward contracts settled during 2012.