over the life of the notes.A portion of the net proceeds from the of fering were used to repurchase all of our outstanding Series  A preferred stock and to fund an accelerated common share repurchase transaction.  The remaining net proceeds will be used to  fund our previously authorized share repurchase program and for other general corporate purposes. We may redeem some or all of the September 2021 Notes and the September 2023 Notes at the following redemption  prices (expressed as percentages of principal amount), plus accrued and unpaid interest to the redemption date, if redeemed  during the 12-month period commencing on September 15 of the years set forth below: Prior to September 15, 2016 for the September 2021 Notes and prior to September 15, 2018 for the September 2023 Notes,  we may redeem some or all of such notes at a price equal to the principal amount thereof, plus accrued and unpaid interest, plus  a “make-whole” premium. We have not separated the make-whole premium from the underlying debt instrument to account for  it as a derivative instrument as the economic characteristics and the risks of this embedded derivative are clearly and closely  related to the economic characteristics and risks of the underlying debt. At any time prior to September 15, 2016, we may redeem up to  35% of the original aggregate principal amount of each of  the September 2021 Notes and September 2023 Notes in an amount not to exceed the amount of proceeds of one or more  equity offerings, at a price equal to 105.375% (for the September 2021 Notes) and 106.000% (for the September 2023 Notes)  of the principal amount of such notes, plus accrued and unpaid interest thereon, provided that at least  50% of the original  aggregate principal amount of the September 2021 Notes (for redemptions of September 2021 Notes) and the September 2023  Notes (for redemptions of September 2023 Notes) remains outstanding after giving ef fect to any such redemption. Interest on our February 2019 Notes and the February 2021 Notes is payable on February 15 and  August 15 of each year  beginning on August 15, 2011. We may redeem some or all of the February 2019 Notes and the February 2021 Notes at the  following redemption prices (expressed as percentages of principal amount), plus accrued and unpaid interest to the redemption  date, if redeemed during the 12-month period commencing on February 15 of the years set forth below: Prior to February 15, 2015 for the February 2019 Notes and prior to February 15, 2016 for the February 2021 Notes,  during any 12-month period, we may at our option redeem up to  10% of the aggregate principal amount of the notes at a  redemption price equal to 103% of the principal amount, plus accrued and unpaid interest. Prior to these dates, we may redeem  some or all of the notes at a price equal to the aggregate principal amount thereof, plus accrued and unpaid interest, plus a  “make-whole” premium. We have not separated the make-whole premium from the underlying debt instrument to account for it  as a derivative instrument as the economic characteristics and risks of this embedded derivative are clearly and closely related  to the economic characteristics and risks of the underlying debt. At any time prior to February 15, 2014 for the February 2019 Notes and February 15, 2015 for the February 2021 Notes,  we may redeem up to 35% of the original aggregate principal amount of the notes in an amount not to exceed the amount of  proceeds of one or more equity of ferings, at a price equal to 106.5% (for the February 2019 Notes) and 106.75% (for the  71 Redemption Price Year February 2019 Notes February 2021 Notes 2015 103.250% 2016 101.625% 103.375% 2017 100.000% 102.250% 2018 100.000% 101.125% 2019 100.000% 2020 100.000% Redemption Price Year September 2021 Notes September 2023 Notes 2016 104.031% 2017 102.688% 2018 101.344% 103.000% 2019 100.000% 102.000% 2020 100.000% 101.000% 2021 100.000% 2022 100.000%