.0 reflecting the difference between the fair value of the new debt and the carrying value of the old debt . the difference between fair value and carrying value will be amortized through march 15 , 2012 , which is the first date holders may require us to repurchase the 4.25% ( 4.25 % ) notes , resulting in a reduction of reported interest expense in future periods . we also recorded a non-cash charge of $ 3.8 for the extinguishment of unamortized debt issuance costs related to the exchanged 4.50% ( 4