(13)    Debt

Our debt consists of the following:

(a) 3.25% Convertible Notes due 2011

In October 2004, we issued $230,000 in aggregate principal amount of 3.25% Convertible Notes due October 15, 2011 (the “3.25% Notes”), which were convertible, at the option of the holder, into shares of our common stock at any time at a conversion rate of 188.6792 shares of common stock for each $1,000 principal amount, or $5.30 per share of common stock. Interest was payable semi-annually on April 15 and October 15 of each year. The obligations under the 3.25% Notes were not secured by any of our assets.

In 2011, we purchased $168,113 of the outstanding 3.25% Notes at prices between 100.75% and 101% of the principal amount plus accrued interest. We recognized a loss on extinguishment of debt for the 3.25% Notes of $2,291 for the year ended December 31, 2011, which consists primarily of cash premiums paid, unamortized discount and deferred financing fees. The remaining $23,866 in principal amount of the 3.25% Notes was paid in October 2011 upon maturity.

(b) 8.75% Senior Notes due 2015

In March 2010, we issued $800,000 aggregate principal amount of 8.75% Senior Notes due 2015 (the “8.75% Notes”). Interest is payable semi-annually in arrears on April 1 and October 1 of each year at a rate of 8.75% per annum. The 8.75% Notes mature on April 1, 2015. The 8.75% Notes were issued for $786,000, resulting in an aggregate original issuance discount of $14,000. Substantially all of our domestic wholly-owned subsidiaries guarantee our obligations under the 8.75% Notes on a senior unsecured basis.

(c) 9.75% Senior Secured Notes due 2015

In August 2009, we issued $257,000 aggregate principal amount of 9.75% Senior Secured Notes due September 1, 2015 (the “9.75% Notes”). Interest is payable semi-annually in arrears on March 1 and September 1 of each year at a rate of 9.75% per annum. The 9.75% Notes were issued for $244,292, resulting in an aggregate original issuance discount of $12,708. Substantially all of our domestic wholly-owned subsidiaries guarantee our obligations under the 9.75% Notes. The 9.75% Notes and related guarantees are secured by first-priority liens on substantially all of our assets and the assets of the guarantors.

(d) 11.25% Senior Secured Notes due 2013

In June 2009, we issued $525,750 aggregate principal amount of 11.25% Senior Secured Notes due 2013 (the “11.25% Notes”). The 11.25% Notes were issued for $488,398, resulting in an aggregate original issuance discount of $37,352.

In October 2010, we purchased $489,065 in aggregate principal amount of the 11.25% Notes. The aggregate purchase price for the 11.25% Notes was $567,927. We recorded an aggregate loss on extinguishment of the 11.25% Notes of $85,216, consisting primarily of unamortized discount, deferred financing fees and repayment premium to Loss on extinguishment of debt and credit facilities, net, in our 2010 consolidated statements of operations. The remainder of the 11.25% Notes of $36,685 was purchased in January 2011 for an aggregate purchase price of $40,376. A loss from extinguishment of debt of $4,915 associated with this purchase was recorded during the year ended December 31, 2011.

(e) 13% Senior Notes due 2013

In July 2008, we issued $778,500 aggregate principal amount of 13% Senior Notes due 2013 (the “13% Notes”). Interest is payable semi-annually in arrears on February 1 and August 1 of each year at a rate of 13% per annum. The 13% Notes mature on August 1, 2013. Substantially all of our domestic wholly-owned subsidiaries guarantee our obligations under the 13% Notes.

(f) 7% Exchangeable Senior Subordinated Notes due 2014

In August 2008, we issued $550,000 aggregate principal amount of 7% Exchangeable Senior Subordinated Notes due 2014 (the “Exchangeable Notes”). The Exchangeable Notes are senior subordinated obligations and rank junior in right of payment to our existing and future senior debt and equally in right of payment with our existing and future senior subordinated debt. Substantially all of our domestic wholly-owned subsidiaries have guaranteed the Exchangeable Notes on a senior subordinated basis.

Interest is payable semi-annually in arrears on June 1 and December 1 of each year at a rate of 7% per annum. The Exchangeable Notes mature on December 1, 2014. The Exchangeable Notes are exchangeable at any time at the option of the holder into shares of our common stock at an initial exchange rate of 533.3333 shares of common stock per $1,000 principal amount of Exchangeable Notes, which is equivalent to an approximate exchange price of $1.875 per share of common stock.

(g) 7.625% Senior Notes due 2018

In October 2010, we issued $700,000 aggregate principal amount of 7.625% Senior Notes due 2018 (the “7.625% Senior Notes”). Interest is payable semi-annually in arrears on May 1 and November 1 of each year at a rate of 7.625% per annum. A majority of the net proceeds were used to purchase $489,065 aggregate principal amount of the 11.25% Notes. The 7.625% Senior Notes mature on November 1, 2018. Substantially all of our domestic wholly-owned subsidiaries guarantee our obligations under the 7.625% Senior Notes.

Covenants and Restrictions

Our debt generally requires compliance with certain covenants that restrict our ability to, among other things, (i) incur additional indebtedness unless our consolidated leverage ratio would be no greater than 6.00 to 1.00 after the incurrence of the indebtedness, (ii) incur liens, (iii) pay dividends or make certain other restricted payments, investments or acquisitions, (iv) enter into certain transactions with affiliates, (v) merge or consolidate with another person, (vi) sell, assign, lease or otherwise dispose of all or substantially all of our assets, and (vii) make voluntary prepayments of certain debt, in each case subject to exceptions.

Under our debt agreements, the following generally constitute an event of default: (i) a default in the payment of interest; (ii) a default in the payment of principal; (iii) failure to comply with covenants; (iv) failure to pay other indebtedness after final maturity or acceleration of other indebtedness exceeding a specified amount; (v) certain events of bankruptcy; (vi) a judgment for payment of money exceeding a specified aggregate amount; and (vii) voidance of subsidiary guarantees, subject to grace periods where applicable. If an event of default occurs and is continuing, our debt could become immediately due and payable.

At December 31, 2011, we were in compliance with our debt covenants.