Debt

3 Months Ended

Mar. 31, 2022

Debt Disclosure [Abstract]

Debt

9. Debt

Our debt consisted of:

	March 31,			December 31,
(In thousands)	2022			2021
2023 Notes	$	96,207		$	240,984
2025 Notes		192,500			192,500
2028 Notes		261,000			—
Total debt		549,707			433,484
Less: Unamortized debt discount and issuance costs		(10,960	)		(38,831	)
Total debt, net	$	538,747		$	394,653
Less: Current portion of long-term debt, net		96,016			—
Total long-term debt, net	$	442,731		$	394,653

Convertible Subordinated Notes Due 2023

In January 2013, we completed an underwritten public offering of $287.5 million aggregate principal amount of our 2023 Notes, which will mature on January 15, 2023. The financing raised proceeds, net of issuance costs, of approximately $281.2 million, less $36.8 million to purchase two privately negotiated capped call option transactions in connection with the issuance of the notes. The 2023 Notes bear interest at the rate of 2.125% per year that is payable semi-annually in arrears in cash on January 15 and July 15 of each year, beginning on July 15, 2013.

At the option of the holders, the 2023 Notes may be converted into fully paid and non-assessable shares of our common stock prior to the close of the business on the second business day immediately preceding the final maturity date. The initial conversion rate was 35.9903 shares per $1,000 principal amount of the 2023 Notes, subject to customary anti-dilution adjustment in certain circumstances, which represented an initial conversion price of approximately $27.79 per share.

In event of default or a fundamental change (as defined in the indenture governing the 2023 Notes), holders of the 2023 Notes may require us to repurchase all or a portion of their 2023 Notes at price equal to 100% of the principal amount of the 2023 Notes, plus any accrued and unpaid interest.

In connection with the offering of the 2023 Notes, we entered into two privately negotiated capped call option transactions with a single counterparty. The capped call option transaction is an integrated instrument consisting of a call option on our common stock purchased by us with a strike price equal to the initial conversion price of $27.79 per share for the underlying number of shares and a cap price of $38.00 per share, both of which are subject to adjustments consistent with the 2023 Notes. The cap component is economically equivalent to a call option sold by us for the underlying number of shares with an initial strike price of $38.00 per share. As an integrated instrument, the settlement of the capped call coincides with the due date of the convertible debt. Upon settlement, we would receive from our hedge counterparty a number of shares of our common shares that would range from zero, if the stock price was below $27.79 per share, to a maximum of 2,779,659 shares, if the stock price is above $38.00 per share. However, if the market price of our common stock, as measured under the terms of the capped call transactions, exceeds $38.00 per share, there is no incremental anti-dilutive benefit from the capped call.

As a result of the partial conversion by certain holders of the 2023 Notes in July 2014, and dividends declared and paid in 2014 and 2015, the conversion rate with respect to our 2023 Notes was adjusted in total to 50.5818 shares of our common stock per $1,000 principal amount of the 2023 Notes, which represents a conversion price of approximately $19.77 per share. As a result of the conversion rate adjustments, the capped call strike price and cap price were also adjusted to $19.77 and $27.04, respectively.

During 2016, we retired a portion of our 2023 Notes with a face value of $14.1 million and carrying value of $13.9 million by way of purchase in the open market.

On March 7, 2022, we used $165.6 million from the sale of the 2028 Notes to repurchase 60% of the 2023 Notes with a face value of $144.8 million. The carrying value of the repurchased 2023 Notes was $144.5 million. Accrued interest was $0.4 million and unamortized debt issuance costs were $0.3 million on the date of repurchase. We recognized a loss on the extinguishment of the 2023 Notes of $20.7 million in other expense, net in the consolidated statement of operations. The repurchase reduced the outstanding principal balance to $96.2 million and unamortized debt issuance costs to $0.2 million. The effective interest rate of the 2023 Notes changed to 2.37%.

Our outstanding 2023 Notes balances consisted of the following:

	March 31,			December 31,
(In thousands)	2022			2021
Liability component
Principal	$	96,207		$	240,984
Debt issuance costs, net		(191	)		(620	)
Net carrying amount	$	96,016		$	240,364

The following table sets forth total interest expense recognized related to the 2023 Notes for the three months ended March 31, 2022 and 2021:

	Three Months Ended March 31,
(In thousands)	2022		2021
Contractual interest expense	$	1,084	$	1,280
Amortization of debt issuance costs		122		141
Total interest and amortization expense	$	1,206	$	1,421

Convertible Senior Notes Due 2025

On August 7, 2017, we completed a private placement of $192.5 million aggregate principal amount of our 2025 Notes. The proceeds include the 2025 Notes sold pursuant to the $17.5 million over-allotment option granted by us to the initial purchasers, which option was exercised in full. The 2025 Notes were sold in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act. The 2025 Notes are senior unsecured obligations and bear interest at a rate of 2.5% per year, payable semi-annually in arrears on February 15 and August 15 of each year, beginning on February 15, 2018.

The 2025 Notes are convertible, based on the applicable conversion rate, into cash, shares of our common stock or a combination thereof, at our election. The initial conversion rate for the 2025 Notes is 57.9240 shares of our common stock per $1,000 principal amount of the 2025 Notes (which is equivalent to an initial conversion price of approximately $17.26 per share), representing a 30.0% conversion premium over the last reported sale price of the Company’s common stock on August 1, 2017, which was $13.28 per share. The conversion rate is subject to customary anti-dilution adjustments in certain circumstances. The 2025 Notes will mature on August 15, 2025, unless repurchased or converted in accordance with their terms prior to such date. Prior to February 15, 2025, the 2025 Notes will be convertible at the option of the holders only upon the occurrence of specified events and during certain periods, as described below. From, and including, February 15, 2025, until the close of business on the second scheduled trading day immediately preceding the maturity date, the 2025 Notes will be convertible at any time.

Holders of the 2025 Notes may convert all or a portion of their 2025 Notes prior to the close of business on February 15, 2025 only under the following circumstances:

•after September 30, 2017, if our closing common stock price for at least 20 days out of the most recent 30 consecutive trading days of the preceding quarter is greater than 130% of the current conversion price of the 2025 Notes;

•for five consecutive business days, if the average trading price per $1,000 of Notes during the prior 10 consecutive trading days is less than 98% of the product of the our closing common stock price and the conversion rate of the 2025 Notes on such day;

•upon the occurrence of specified corporate events, including certain distributions, the occurrence of a fundamental changes (as defined in the indenture governing the 2025 Notes) or a transaction resulting in our common stock converting into other securities or property or assets.

On or after February 15, 2025, holders of the 2025 Notes may convert their 2025 Notes at any time until the close of business on the second scheduled trading day immediately preceding the maturity date of the 2025 Notes.

In event of default or a fundamental change (as defined above), holders of the 2025 Notes may require us to repurchase all or a portion of their 2025 Notes at price equal to 100% of the principal amount of the 2025 Notes, plus any accrued and unpaid interest.

Effective January 1, 2022, we adopted ASU 2020-06 using a modified retrospective method, under which financial results reported in prior periods were not adjusted. The adoption of ASU 2020-06 had a material impact on the 2025 notes.

Prior to the adoption of the standard, we separately account for the liability and equity components of the 2025 Notes by allocating the proceeds between the liability component and the embedded conversion option (“equity component”) due to our ability to settle the conversion obligation of the 2025 Notes in cash, common stock or a combination of cash and common stock, at our option. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature using the income approach. The allocation was performed in a manner that reflected our non-convertible debt borrowing rate for similar debt. The equity component of the 2025 Notes of $67.3 million was recognized as a debt discount and represents the difference between the proceeds from the issuance of the 2025 Notes and the fair value of the liability of the 2025 Notes on the date of issuance. The excess of the principal amount of the liability component over its carrying amount (“debt discount”) is amortized to interest expense using the effective interest method over the term of the 2025 Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. Additionally, we separated the total issuance costs of $5.4 million incurred into liability and equity components in proportion to the allocation of the initial proceeds, resulting in liability issuance costs of $3.5 million and equity issuance costs of $1.9 million. Issuance costs attributable to the liability component were amortized on a straight-line basis, which approximated the effective interest rate method, to interest expense over the term of the 2025 Notes. The issuance costs attributable to the equity component were netted against the equity component in additional paid-in capital. The effective interest rate of the liability component of the 2025 Notes was 8.87%.

Upon adoption of ASU 2020-06 on January 1, 2022, we combined the liability and equity components of the 2025 Notes assuming that the instrument was accounted for as a single liability from inception to the date of adoption. We similarly combined the liability and equity components of the issuance costs. The issuance costs are presented as a deduction from the outstanding principal balance of the 2025 Notes, and are amortized on a straight-line basis over the term of the 2025 Notes under the effective interest rate method. As of January 1, 2022, the effective interest rate on the 2025 Notes was 2.88%.

Our outstanding 2025 Notes balances consisted of the following:

	March 31,			December 31,
(In thousands)	2022			2021
Liability component
Principal	$	192,500		$	192,500
Debt discount and issuance costs, net		(2,437	)		(38,211	)
Net carrying amount	$	190,063		$	154,289
Equity component, net	$	—		$	65,361

The following table sets forth total interest expense recognized related to the 2025 Notes for the three months ended March 31, 2022 and 2021:

	Three Months Ended March 31,
(In thousands)	2022		2021
Contractual interest expense	$	1,203	$	1,203
Amortization of debt issuance costs		171		159
Amortization of debt discount		—		1,911
Total interest and amortization expense	$	1,374	$	3,273

Convertible Senior Notes Due 2028

In March 2022, we completed a private placement of $261.0 million aggregate principal amount of our 2028 Notes, which will mature on March 15, 2028. The proceeds include the 2028 Notes sold pursuant to the $45.0 million over-allotment option granted by us to the initial purchasers, of which $36.0 million was exercised. The 2028 Notes were sold in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act.

The net proceeds from the sale of the $261.0 million aggregate principal amount of 2028 Notes were approximately $252.6 million after deducting the initial purchasers’ discounts and commissions and our estimated offering expenses. We used approximately $21.0 million of the net proceeds from the offering to fund the cost of entering into the capped call transactions described below. In addition, we used $165.6 million of the remaining net proceeds to repurchase $144.8 million aggregate principal amount of the 2023 Notes in separate and individually negotiated transactions with certain holders of the 2023 Notes, which closed concurrently with the issuance of the 2028 Notes. We expect to use the remaining net proceeds for general corporate purposes.

The 2028 Notes bear interest at an annual rate of 2.125% that is payable semi-annually in arrears in cash on March 15 and September 15 of each year, beginning on September 15, 2022.

The 2028 Notes are convertible, based on the applicable conversion rate, into cash, shares of our common stock or a combination thereof, at our election. The initial conversion rate was 38.1432 shares per $1,000 principal amount of the 2028 Notes, subject to customary anti-dilution adjustment in certain circumstances, which represented an initial conversion price of approximately $26.22 per share.

Prior to September 15, 2027, the 2028 Notes will be convertible at the option of the holders only upon the occurrence of specified events and during certain periods, and will be convertible on or after September 15, 2027, at any time until the close of business on the second scheduled trading day immediately preceding the maturity date of the Notes.

Holders of the 2028 Notes may convert all or a portion of their 2028 Notes prior to the close of business on September 15, 2027, only under the following circumstances:

•after March 31, 2022, if our closing common stock price for at least 20 days out of the most recent 30 consecutive trading days of the preceding quarter is greater than 130% of the current conversion price of the 2028 Notes;

•for five consecutive business days, if the average trading price per $1,000 of Notes during the prior 10 consecutive trading days is less than 98% of the product of our closing common stock price and the conversion rate of the 2028 Notes on such day;

•upon the occurrence of specified corporate events, including certain distributions, the occurrence of a fundamental changes (as defined in the indenture governing the 2028 Notes) or a transaction resulting in our common stock converting into other securities or property or assets.

On or after September 15, 2027, holders of the 2028 Notes may convert their 2028 Notes at any time until the close of the business on the second day immediately preceding the maturity date of the 2028 Notes.

The 2028 Notes will be redeemable, in whole or in part, at our option at any time, and from time to time, on or after March 20, 2025, and on or before the 75th scheduled trading day immediately before the maturity date but only if the last reported sale price per share of our common stock exceeds 130% of the conversion price for a specified period of time. The redemption price will be equal to the principal amount of the 2028 Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. In addition, calling any 2028 Note for redemption will constitute a make-whole fundamental change (as defined in the indenture governing the 2028 Notes) with respect to that 2028 Note, in which case the conversion rate applicable to the conversion of that 2028 Note will be increased in certain circumstances if it is converted after it is called for redemption.

If we undergo a fundamental change, subject to certain conditions, holders may require us to purchase for cash all or any portion of their 2028 Notes. The fundamental change purchase price will be 100% of the principal amount of the 2028 Notes to be purchased plus any accrued and unpaid interest to, but excluding, the fundamental change purchase date.

The indenture governing the 2028 Notes contains customary terms and covenants, including a merger covenant and that upon certain events of default occurring and continuing, either the Trustee or the holders of at least 25% of the aggregate principal amount of the outstanding Notes may declare 100% of the principal of, and accrued and unpaid interest, if any, on, all the Notes to be due and payable immediately.

In connection with the offering of the 2028 Notes, we entered into privately negotiated capped call transactions. The cap price of the capped call transaction is initially $33.9850 per share and is subject to certain adjustments under the terms of the capped call transactions. The capped call transactions cover, subject to customary adjustments, the number of shares of common stock initially underlying the 2028 Notes. The capped call transactions are expected generally to reduce potential dilution to our common stock upon conversion of the 2028 Notes or at our election (subject to certain conditions) offset any cash payments we are required to make in excess of the aggregate principal amount of converted 2028 Notes, as the case may be, with such reduction or offset subject to a cap.

As of March 31, 2022, the effective interest rate on the 2028 Notes was 2.69%.

Our outstanding 2028 Notes balance as of March 31, 2022 consisted of the following:

(In thousands)
Liability component
Principal	$	261,000
Debt issuance costs, net		(8,332	)
Net carrying amount	$	252,668

The following table sets forth total interest expense recognized related to the 2028 Notes from the date of issuance through March 31, 2022:

(In thousands)
Contractual interest expense	$	346
Amortization of debt issuance costs		84
Total interest and amortization expense	$	430

Debt Maturities

The aggregate scheduled maturities of our convertible debt as of March 31, 2022 were as follows:

(In thousands)
Years ending December 31:
Remainder of 2022	$	—
2023		96,207
2024		—
2025		192,500
2026		—
Thereafter		261,000
Total	$	549,707