Convertible Debt	9 Months Ended
Sep. 30, 2011
Convertible Debt [Abstract]
Convertible Debt	(10) CONVERTIBLE DEBT In April 2007, the Company sold approximately $324.9 million of senior subordinated convertible notes due 2017 (the 2017 Notes). The debt was issued at face value and bears interest at the rate of 1.875% per annum, payable semi-annually in cash. The debt is convertible, at the option of the holder, at any time prior to maturity or redemption, into shares of the Company's common stock at a conversion price of approximately $20.36 per share, subject to adjustment in certain circumstances. The debt does not include a call provision and the Company is unable to unilaterally redeem the debt prior to maturity on April 23, 2017. The Company also must repay the debt if there is a qualifying change in control or termination of trading of its common stock. In connection with the placement of the 2017 Notes, the Company paid approximately $8.5 million in offering costs, which have been deferred and are included in other assets. The deferred offering costs are being amortized as interest expense over the life of the debt, and in each of the three and nine months ended September 30, 2011 and 2010, the Company recognized amortization of expense of $0.2 million and $0.6 million, respectively. In March 2006, the Company sold $172.5 million of senior subordinated convertible notes due 2013 (the 2013 Notes). The debt was issued at face value and bears interest at the rate of 2.5% per annum, payable semi-annually in cash. The debt is convertible, at the option of the holder, at any time prior to maturity or redemption, into shares of the Company's common stock at a conversion price of approximately $16.58 per share, subject to adjustment in certain circumstances. The debt does not include a call provision and the Company is unable to unilaterally redeem the debt prior to maturity on March 29, 2013. The Company also must repay the debt if there is a qualifying change in control or termination of trading of its common stock. In connection with the placement of the 2013 Notes, the Company paid approximately $5.5 million in offering costs, which have been deferred and are included in other assets. The deferred offering costs are being amortized as interest expense over the life of the debt. The Company recognized amortization expense of approximately $0.1 million and $0.2 million for the three and nine months ended September 30, 2011, respectively, compared to the three and nine months ended September 30, 2010 when amortization expense was $0.2 million and $0.6 million, respectively. The decrease in amortization expense for the three and nine months ended September 30, 2011, compared to the three and nine months ended September 30, 2010 was attributed to the conversion of $119.6 million in aggregate principal of the 2013 Notes in November 2010. In September 2011, the Company entered into separate agreements with six of the existing holders of its 2013 Notes pursuant to which such holders converted $29.2 million in aggregate principal amount of the 2013 Notes into 1,760,178 shares of the Company's common stock. In addition to issuing the requisite number of shares of the Company's common stock pursuant to the 2013 Notes, the Company paid the holders future interest of approximately $1.1 million along with an aggregate of approximately $0.8 million related to varying cash premiums for agreeing to convert the 2013 Notes, which was recognized in total as debt conversion expense on the Company's Consolidated Statement of Operations for the three and nine months ended September 30, 2011. Additionally, the Company reclassified $0.2 million of deferred offering costs to additional paid-in capital in connection with the conversion of the 2013 Notes. In November 2010, the Company entered into separate agreements with nine of the existing holders of its 2013 Notes pursuant to which such holders converted $119.6 million in aggregate principal amount of the 2013 Notes into 7,213,379 shares of the Company's common stock. In addition to issuing the requisite number of shares of the Company's common stock pursuant to the 2013 Notes, the Company paid the holders future interest of approximately $7.2 million along with an aggregate of approximately $6.5 million related to varying cash premiums for agreeing to convert the 2013 Notes, which was recognized in total as debt conversion expense on the Company's Consolidated Statement of Operations for the year ended December 31, 2010. Additionally, the Company reclassified $1.3 million of deferred offering costs to additional paid-in capital in connection with the conversion of the 2013 Notes. Interest expense on the Company's convertible debt for the three and nine months ended September 30, 2011 was $1.8 million and $5.5 million, respectively, compared to the three and nine months ended September 30, 2010 when interest expense related to the Company's convertible debt was $2.6 million and $7.8 million, respectively. The decrease in interest expense related to the Company's convertible debt in the three and nine months ended September 30, 2011, compared to the three and nine months ended September 30, 2010 was attributed to the conversion of $29.2 million and $119.6 million in aggregate principal of the 2013 Notes in September 2011 and November 2010, respectively.

(10) CONVERTIBLE DEBT

In April 2007, the Company sold approximately $324.9 million of senior subordinated convertible notes due 2017 (the 2017 Notes). The debt was issued at face value and bears interest at the rate of 1.875% per annum, payable semi-annually in cash. The debt is convertible, at the option of the holder, at any time prior to maturity or redemption, into shares of the Company's common stock at a conversion price of approximately $20.36 per share, subject to adjustment in certain circumstances. The debt does not include a call provision and the Company is unable to unilaterally redeem the debt prior to maturity on April 23, 2017. The Company also must repay the debt if there is a qualifying change in control or termination of trading of its common stock.

In connection with the placement of the 2017 Notes, the Company paid approximately $8.5 million in offering costs, which have been deferred and are included in other assets. The deferred offering costs are being amortized as interest expense over the life of the debt, and in each of the three and nine months ended September 30, 2011 and 2010, the Company recognized amortization of expense of $0.2 million and $0.6 million, respectively.

In March 2006, the Company sold $172.5 million of senior subordinated convertible notes due 2013 (the 2013 Notes). The debt was issued at face value and bears interest at the rate of 2.5% per annum, payable semi-annually in cash. The debt is convertible, at the option of the holder, at any time prior to maturity or redemption, into shares of the Company's common stock at a conversion price of approximately $16.58 per share, subject to adjustment in certain circumstances. The debt does not include a call provision and the Company is unable to unilaterally redeem the debt prior to maturity on March 29, 2013. The Company also must repay the debt if there is a qualifying change in control or termination of trading of its common stock.

In connection with the placement of the 2013 Notes, the Company paid approximately $5.5 million in offering costs, which have been deferred and are included in other assets. The deferred offering costs are being amortized as interest expense over the life of the debt. The Company recognized amortization expense of approximately $0.1 million and $0.2 million for the three and nine months ended September 30, 2011, respectively, compared to the three and nine months ended September 30, 2010 when amortization expense was $0.2 million and $0.6 million, respectively. The decrease in amortization expense for the three and nine months ended September 30, 2011, compared to the three and nine months ended September 30, 2010 was attributed to the conversion of $119.6 million in aggregate principal of the 2013 Notes in November 2010.

In September 2011, the Company entered into separate agreements with six of the existing holders of its 2013 Notes pursuant to which such holders converted $29.2 million in aggregate principal amount of the 2013 Notes into 1,760,178 shares of the Company's common stock. In addition to issuing the requisite number of shares of the Company's common stock pursuant to the 2013 Notes, the Company paid the holders future interest of approximately $1.1 million along with an aggregate of approximately $0.8 million related to varying cash premiums for agreeing to convert the 2013 Notes, which was recognized in total as debt conversion expense on the Company's Consolidated Statement of Operations for the three and nine months ended September 30, 2011. Additionally, the Company reclassified $0.2 million of deferred offering costs to additional paid-in capital in connection with the conversion of the 2013 Notes.

In November 2010, the Company entered into separate agreements with nine of the existing holders of its 2013 Notes pursuant to which such holders converted $119.6 million in aggregate principal amount of the 2013 Notes into 7,213,379 shares of the Company's common stock. In addition to issuing the requisite number of shares of the Company's common stock pursuant to the 2013 Notes, the Company paid the holders future interest of approximately $7.2 million along with an aggregate of approximately $6.5 million related to varying cash premiums for agreeing to convert the 2013 Notes, which was recognized in total as debt conversion expense on the Company's Consolidated Statement of Operations for the year ended December 31, 2010. Additionally, the Company reclassified $1.3 million of deferred offering costs to additional paid-in capital in connection with the conversion of the 2013 Notes.

Interest expense on the Company's convertible debt for the three and nine months ended September 30, 2011 was $1.8 million and $5.5 million, respectively, compared to the three and nine months ended September 30, 2010 when interest expense related to the Company's convertible debt was $2.6 million and $7.8 million, respectively. The decrease in interest expense related to the Company's convertible debt in the three and nine months ended September 30, 2011, compared to the three and nine months ended September 30, 2010 was attributed to the conversion of $29.2 million and $119.6 million in aggregate principal of the 2013 Notes in September 2011 and November 2010, respectively.