Convertible Senior Notes, Net

On March 17, 2014, the Company issued $143.8 million aggregate principal amount of 5.50% Convertible Senior Notes due 2019 (the "March 2019 Notes"), for which the Company received net proceeds, after deducting the underwriting discount and estimated offering expense payable by the Company, of approximately $139.0 million. At March 31, 2018, the March 2019 Notes had a carrying value of $142.7 million and an unamortized discount of $1.1 million.

On August 18, 2014, the Company issued an additional $111.0 million aggregate principal amount of 5.50% Convertible Senior Notes due 2019 (the "August 2019 Notes," and together with the March 2019 Notes, the "2019 Notes"), for which the Company received net proceeds, after deducting the underwriting discount and estimated offering expense payable by the Company, of approximately $109.6 million. At March 31, 2018, the August 2019 Notes had a carrying value of $109.7 million and an unamortized discount of $1.3 million.

On August 21, 2017, the Company issued an aggregate principal amount of $230.0 million of 4.75% Convertible Senior Notes due 2022 (the "August 2022 Notes"), for which the Company received net proceeds, after deducting the underwriting discount and estimated offering expense payable by the Company, of approximately $224.8 million. At March 31, 2018, the August 2022 Notes had a carrying value of $221.3 million and an unamortized discount of $8.7 million.

On November 9, 2017, the Company issued an aggregate principal amount of $115.0 million of 4.75% Convertible Senior Notes due 2022 (the "November 2022 Notes," and together with the August 2022 Notes, the "2022 Notes" and the 2022 Notes together with the 2019 Notes, "the Notes"), for which the Company received net proceeds, after deducting the underwriting discount and estimated offering expense payable by the Company of approximately $112.7 million. At March 31, 2018, the November 2022 Notes had a carrying value of $112.2 million and an unamortized discount of $2.8 million.

The following table summarizes the terms of the Notes ($ in thousands):



	Principal Amount		Coupon Rate		Effective Rate ⁽¹⁾		Conversion Rate ⁽²⁾	Maturity Date	Remaining Period of Amortization
2019 Notes	$	254,750	5.50	%	6.36	%	57.6745	3/15/2019	0.95 years
2022 Notes	345,000		4.75	%	5.61	%	50.2260	8/23/2022	4.40 years
Total	$	599,750

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(1)	Effective rate includes the effect of the adjustment for the conversion option (See endnote (2) below), the value of which reduced the initial liability and was recorded in additional paid-in-capital.

(2)

The Company has the option to settle any conversions in cash, shares of common stock or a combination thereof. The conversion rate represents the number of shares of common stock issuable per $1.0 million principal amount of the Notes converted, and includes adjustments relating to cash dividend payments made by the Company to stockholders that have been deferred and carried-forward in accordance with, and are not yet required to be made pursuant to, the terms of the applicable supplemental indenture.

The Company may not redeem the Notes prior to maturity. The closing price of the Company's common stock on March 29, 2018 of $17.98 was greater than the per share conversion price of the 2019 Notes and less than the per share conversion price of the 2022 Notes. The Company has the intent and ability to settle the Notes in cash and, as a result, the Notes did not have any impact on the Company's diluted earnings per share.

In accordance with ASC 470 the liability and equity components of convertible debt instruments that may be settled in cash upon conversion (including partial cash settlement) is to be separately accounted for in a manner that reflects the issuer’s nonconvertible debt borrowing rate. GAAP requires that the initial proceeds from the sale of the Notes be allocated between a liability component and an equity component in a manner that reflects interest expense at the interest rate of similar nonconvertible debt that could have been issued by the Company at such time. The Company measured the fair value of the debt components of the Notes as of their issuance date based on effective interest rates. As a result, the Company attributed approximately $22.4 million of the proceeds to the equity component of the Notes ($11.4 million to the 2019 Notes and $11.0 million to the 2022 Notes), which represents the excess proceeds received over the fair value of the liability component of the Notes at the date of issuance. The equity component of the Notes has been reflected within additional paid-in capital in the condensed consolidated balance sheet as of March 31, 2018. The resulting debt discount is being amortized over the period during which the Notes are expected to be outstanding (the maturity date) as additional non-cash interest expense. The additional non-cash interest expense attributable to each of the Notes will increase in subsequent reporting periods through the maturity date as the Notes accrete to their par value over the same period.

The aggregate contractual interest expense was approximately $7.6 million and $3.5 million for the three months ended March 31, 2018 and 2017, respectively. With respect to the amortization of the discount on the liability component of the Notes as well as the amortization of deferred financing costs, the Company reported additional non-cash interest expense of approximately $1.8 million and $0.9 million for the three months ended March 31, 2018 and 2017, respectively.