Our debt as of December 31, 2015 and 2014 consisted of the following:

Retired and Converted Debt

During the year ended December 31, 2014, $502,370 in principal amount of the Exchangeable Notes were converted, resulting in the issuance of 272,856 shares of our common stock.  No loss was recognized as a result of this conversion.

During the year ended December 31, 2013, we purchased $800,000 of our then outstanding 8.75% Senior Notes due 2015, for an aggregate purchase price, including premium and interest, of $927,860.  We recognized $104,818 to Loss on extinguishment of debt and credit facilities, net, consisting primarily of unamortized discount, deferred financing fees and repayment premium, as a result of this transaction.

During the year ended December 31, 2013, we also purchased $700,000 of our then outstanding 7.625% Senior Notes due 2018, for an aggregate purchase price, including premium and interest, of $797,830.  We recognized $85,759 to Loss on extinguishment of debt and credit facilities, net, consisting primarily of unamortized discount, deferred financing fees and repayment premium, as a result of this transaction.

Covenants and Restrictions

Under the Credit Facility, Sirius XM, our wholly-owned subsidiary, must comply with a debt maintenance covenant that it not exceed a total leverage ratio, calculated as consolidated total debt to consolidated operating cash flow, of 5.0 to 1.0.  The Credit Facility generally requires compliance with certain covenants that restrict Sirius XM's ability to, among other things, (i) incur additional 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 Sirius XM's assets, and (vii) make voluntary prepayments of certain debt, in each case subject to exceptions.

The indentures governing Sirius XM's notes restrict Sirius XM's non-guarantor subsidiaries' ability to create, assume, incur or guarantee additional indebtedness without such non-guarantor subsidiary guaranteeing each such series of notes on a pari passu basis.  The indentures governing the notes also contain covenants that, among other things, limit Sirius XM's ability and the ability of its subsidiaries to create certain liens; enter into sale/leaseback transactions; and merge or consolidate.

Under Sirius XM's 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, 2015 and 2014, we were in compliance with our debt covenants.