In accordance with FASB ASC 470-20, Debt with Conversion and Other Options, which applies
to certain convertible debt instruments that may be settled in cash or other assets, or partially in cash, upon conversion, we recorded the long-term debt and equity components on our 2017 Notes separately on the issuance date. The amount recorded
for long-term debt was determined by measuring the fair value of a similar liability that does not have an associated equity component. The equity component of $55.0 million was recorded in additional paid-in-capital. The measurement of fair
value required the Company to make estimates and assumptions to determine the present value of the cash flows of the 2017 Notes, absent the conversion feature. This treatment increased interest expense associated with our 2017 Notes by adding a
non-cash component to interest expense in the form of amortization of a debt discount calculated based on the difference between the 3.5% cash coupon rate and the effective interest rate on debt borrowing of approximately 12.5%. The discount is
being amortized to interest expense through the December 15, 2017 maturity date of the 2017 Notes using the effective interest method. Additionally, we allocated the costs related to issuance of the 2017 Notes on the same percentage as the
long-term debt and equity components, such that a portion of the costs is allocated to the long-term debt component and the equity component included in additional paid-in capital. The portion of the costs allocated to the long-term debt component
is presented as deferred financing costs, net on our condensed consolidated balance sheets. These deferred financing costs are also being amortized to interest expense through the December 15, 2017 maturity date of the 2017 Notes using the
effective interest method.
Based on the initial conversion rate of 10 shares of our common stock per $1,000 principal amount of 2017
Notes, which corresponds to an initial conversion price of $100.00 per share of our common stock, the number of shares issuable upon conversion of the 2017 Notes is 424,710. The value of these shares, based on the closing price of our common stock
on September 30, 2015 of $52.31 per share, was approximately $22.2 million. The fair value of our 2017 Notes as presented in Note 4 was $46.1 million at September 30, 2015.
1.75% Convertible Senior Notes
In May 2015, we issued $84.2 million principal amount of 1.75% convertible senior notes due December 15, 2021 (the
2021 Notes), unless earlier repurchased, redeemed or converted. Combined with the 2021 Notes issued in connection with the Exchange described above, the aggregate principal amount issued under the 2021 Notes was $202.4 million. The
Exchange resulted in the retirement of outstanding 2017 Notes with a carrying value of $83.1 million, the write-off of unamortized debt issuance costs of $1.0 million and settlement of $10.7 million related to the conversion feature embedded in
the 2017 Notes. The 2021 Notes offered in the Exchange had a fair value of $88.0 million, which resulted in a loss on extinguishment of debt of $16.6 million in the three months ended June 30, 2015.
The net proceeds from the issuance of the 2021 Notes amounted to $75.5 million, net of deferred issuance costs paid as of September 30,
2015. In connection with the issuance of the 2021 Notes, we incurred costs of approximately $5.2 million.
Interest on the 2021 Notes is
payable semiannually in arrears on June 15 and December 15, at a rate of 1.75% per annum, beginning on December 15, 2015.
The 2021 Notes will mature on December 15, 2021 unless earlier repurchased, redeemed or converted. Prior to the close of business on the
business day immediately preceding June 15, 2021, holders may convert their 2021 Notes at their option only under the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on June 30,
2015 (and only during such calendar quarter), if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on the last trading day of the
immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the measurement
period) in which the trading price per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate on such trading
day; (3) upon the occurrence of specified corporate events, or (4) if we call the 2021 Notes for redemption, until the close of business on the business day immediately preceding the redemption date. As of the date of this report on Form
10-Q, none of the events that would allow holders to convert their 2021 Notes have occurred. On or after June 15, 2021 until the close of business on the scheduled trading day immediately preceding the maturity date, holders may convert their
2021 Notes at any time, regardless of whether any of the foregoing conditions has been met. Upon conversion, we will satisfy our conversion obligation by paying or delivering, as the case may be, cash, shares of our common stock or a combination of
cash and shares of our common stock, at our election.