CONVERTIBLE SENIOR NOTES

Overview

On December 17, 2013, we entered into an agreement for the sale of $120 million aggregate principal amount of 2.75% Convertible Senior Notes (equaling 120,000 notes, denominated in $1,000 principal units) due December 2018 (the “2018 Convertible Notes”). The 2018 Convertible Notes are convertible into shares of our common stock at a conversion rate of 95 shares per $1,000 principal units, equating to 11.4 million common shares if fully converted. The in-the-money conversion price is equivalent to $10.53 per common share. The conversion rate and conversion price is subject to adjustment under certain limited circumstances. The 2018 Convertible Notes bear interest at a rate of 2.75% per year, payable semiannually in arrears on June 15 and December 15 of each year. The 2018 Convertible Notes will mature and become payable on December 15, 2018, subject to earlier conversion into common stock at the holders’ option.

The sale of the 2018 Convertible Notes closed on December 23, 2013 and our net proceeds were $115.4 million, after deducting banker and professional fees of $4.6 million. We used a portion of these net proceeds to simultaneously enter into “bought call” and “sold warrant” transactions with Royal Bank of Canada (collectively, the “Note Hedge”). We recorded the Note Hedge on a net cost basis of $13.1 million, as a reduction to “additional paid-in capital” in our accompanying Condensed Consolidated Balance Sheets. Under applicable GAAP, the Note Hedge transaction has not been (and is not expected to be) marked-to-market through earnings or comprehensive income.

Open Market Purchases of 2018 Convertible Notes and Conversion Hedge Unwind

In December 2016, we completed two open market purchases of our 2018 Convertible Notes, aggregating 9,963 note units (equivalent to $10 million principal value) for $9.0 million. We recognized an aggregate loss of $25,000 on the retirement of these 2018 Convertible Notes (based on its carrying value under GAAP), which is included in "other income (expense), net" on the Consolidated Statements of Operations for the year ended December 31, 2016. Accordingly, as of March 31, 2017, $110 million in principal of our 2018 Convertible Notes are outstanding.

We concurrently unwound a portion of our previously sold warrants and previously purchased call options that were part of our "conversion hedge" for aggregate net proceeds of $21,000, with a corresponding net increase to "additional paid-in capital" in the Condensed Consolidated Balance Sheets as of December 31, 2016.

Conversion Hedge

We entered into Note Hedge transactions in December 2013 to reduce the potential dilution to our stockholders and/or offset any cash payments that we are required to make in excess of the principal amount, upon conversion of the 2018 Convertible Notes (in the event that the market price of our common stock is greater than the conversion price). The strike price of the “bought call” is equal to the conversion price and conversion rate of the 2018 Convertible Notes, then matching the 11.4 million common shares the 2018 Convertible Notes may be converted into. The strike price of our “sold warrant” is $14.03 per share of our common stock, and is also for 11.4 million common shares.

Conversion Events

On and after June 15, 2018, and until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or a portion of their 2018 Convertible Notes. Prior to June 15, 2018, holders may convert all or a portion of their 2018 Convertible Notes only under any of the following circumstances: (1) during any fiscal quarter (and only during such fiscal quarter), if, for at least 20 trading days (whether or not consecutive) during the 30 consecutive trading day period ending on the last trading day of the immediately preceding fiscal quarter, the last reported sale price of our common stock on such trading day is greater than or equal to 130% of the Notes' conversion price on such trading day; (2) during the five consecutive business day period immediately following any five consecutive trading day period in which, for each trading day of that measurement period, the trading price per $1,000 principal amount of 2018 Convertible Notes for such trading day was less than 98% of the product of (i) the last reported sale price of our common stock on such trading day and (ii) the applicable conversion rate on such trading day; (3) upon the occurrence of certain corporate transactions; and (4) at any time prior to our stockholders’ approval to settle the 2018 Convertible Notes in our common shares and/or cash.

As of March 31, 2017, the 2018 Convertible Notes are not eligible to be converted into our common stock as none of the above elements (1) through (4) were met. Our stockholders’ approval of "flexible settlement" occurred at our Annual Meeting of Stockholders on June 29, 2015. As a result, we may (at our election) settle any future conversions of the 2018 Convertible Notes by paying or delivering cash, shares of our common stock, or a combination of cash and shares of our common stock. However, if the holders of the Convertible Notes do not elect any conversion into our common stock, our December 2018 obligation to repay the principal amount of $110 million in cash, plus any accrued and unpaid interest, is unchanged.

Carrying Value and Fair Value

The carrying value of the 2018 Convertible Notes as of March 31, 2017 and December 31, 2016, is summarized as follows:



	March 31, 2017			December 31, 2016
Principal amount	$	110,037		$	110,037
(Less): Unamortized debt discount (amortized through December 2018)	(10,265		)	(11,646		)
(Less): Debt issuance costs	(1,182		)	(1,348		)
Carrying value	$	98,590		$	97,043

As of March 31, 2017 and December 31, 2016, the estimated aggregate fair value of the 2018 Notes is $112.1 million and $101.8 million, respectively. These estimated fair values represent a Level 2 measurement (see Note 2(xiii)), based upon the 2018 Convertible Notes' quoted bid price at each date in a thinly-traded market.

Components of Interest Expense on 2018 Convertible Notes

The following table sets forth the components of interest expense recognized in the accompanying Condensed Consolidated Statements of Operations for the 2018 Convertible Notes for the three months ended March 31, 2017 and 2016:



	Three Months Ended March 31,
	2017			2016
Contractual coupon interest expense	$	757		$	825
Amortization of debt issuance costs	166			171
Accretion of debt discount	1,381			1,385
Total	$	2,304		$	2,381
Effective interest rate	8.65		%	8.66		%