Long-term Debt

9 Months Ended

Sep. 30, 2020

Revolving Credit Facility

On June 9, 2017, the Company entered into a Credit Agreement, as amended (the “Credit Agreement”), with Wells Fargo Bank, National Association, as administrative agent and the other lenders parties thereto. The Credit Agreement provides for revolving credit borrowings up to a maximum principal amount of $125.0 million, subject to a commitment increase of $75.0 million. All outstanding amounts owed under the Credit Agreement become due and payable no later than the final maturity date of June 9, 2022. As of September 30, 2020, there was no outstanding balance under the Credit Agreement.

The Credit Agreement also allows for the issuance of letters of credit in the aggregate amount of up to $10.0 million at any one time; outstanding letters of credit reduce the credit available for revolving credit borrowings. As of September 30, 2020, the Company had two outstanding letters of credit for $0.2 million. Substantially all of the Company’s assets are pledged to secure the credit facility.

Borrowings under the Credit Agreement bear interest at the Company’s option of the prime rate (3.25% on September 30, 2020) plus a margin ranging from 0.00% to 0.50% or one month LIBOR (0.15% on September 30, 2020) plus a margin ranging from 1.00% to 1.75%. The Company incurs an annual commitment fee of 0.15% to 0.20% on the unused portion of the line of credit. The additional margin amount and annual commitment fee are dependent on the level of outstanding borrowings. As of September 30, 2020, the Company had $124.8 million of unused borrowing capacity.

The Company is required to comply with various financial covenants under the Credit Agreement. Specifically, the Company is required to maintain a ratio of earnings before interest, taxes, depreciation, and amortization (“EBITDA”) plus stock compensation to interest expense for the previous four consecutive fiscal quarters of not less than 3.00 to 1.00 and a ratio of indebtedness to EBITDA plus stock compensation (“Leverage Ratio”) of not more than 3.00 to 1.00. Additionally, the Credit Agreement currently restricts the payment of dividends that would result in a pro-forma Leverage Ratio of more than 2.00 to 1.00.

At September 30, 2020, the Company was in compliance with all covenants under the Credit Agreement.

Convertible Senior Notes due 2025

On August 14, 2020, the Company issued $230.0 million aggregate principal amount of 1.250% Convertible Senior Notes Due 2025 (the “2025 Notes”) in a private placement to qualified institutional purchasers pursuant to an exemption from registration provided by Section 4(a)(2) and Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”). The net proceeds from the offerings, after deducting the initial purchasers’ discount and issuance costs of $7.3 million, were $222.7 million. The Company used (i) $172.0 million of the net proceeds to partially repurchase the 2023 Notes (as defined and described below), and (ii) $26.7 million of the net proceeds to fund the cost of entering into the 2025 Notes Hedges (as defined below), after such cost was partially offset by the proceeds that the Company received from entering into the 2025 Notes Warrants (as defined below). The remaining proceeds of $24.0 million will be used for working capital or other general corporate purposes.

The 2025 Notes bear interest at a rate of 1.250% per year. Interest is payable in cash on February 1 and August 1 of each year, with the first payment to be made on February 1, 2021. The 2025 Notes mature on August 1, 2025 unless earlier converted, redeemed or repurchased in accordance with their terms prior to such date. The initial conversion rate is 19.3538 shares of the Company’s common stock per $1,000 principal amount of 2025 Notes, which is equivalent to an initial conversion price of approximately $51.67 per share of common stock. After consideration of the 2025 Notes Hedges and 2025 Notes Warrants, the conversion rate is effectively hedged to a price of $81.05 per share of common stock. The conversion rate, and thus the conversion price, may be adjusted under certain circumstances as described in the indenture governing the 2025 Notes (the “2025 Indenture”). The Company may settle conversions by paying or delivering, as applicable, cash, shares of its common stock or a combination of cash and shares of its common stock, at the Company’s election, based on the applicable conversion rate(s). If a “make-whole fundamental change” (as defined in the 2025 Indenture) occurs, then the Company will in certain circumstances increase the conversion rate for a specified period of time. The Company’s intent is to settle the principal amount of the 2025 Notes in cash upon conversion.

In accordance with accounting for debt with conversions and other options, the Company bifurcated the principal amount of the 2025 Notes into liability and equity components. The initial liability component of the 2025 Notes was valued at $181.1 million based on the contractual cash flows discounted at an appropriate comparable market non-convertible debt borrowing rate at the date of issuance of 6.3%. The equity component representing the conversion option and calculated as the

residual amount of the proceeds was recorded as an increase in additional paid-in capital within stockholders’ equity of $48.9 million, partially offset by the associated deferred tax effect of $12.6 million. The amount recorded within additional paid-in capital is not to be remeasured as long as it continues to meet the conditions for equity classification. The resulting debt discount of $48.9 million is being amortized to interest expense using the effective interest method with an effective interest rate of 6.3% over the period from the issuance date through the contractual maturity date of August 1, 2025. The Company utilizes the treasury stock method to calculate the effects of the 2025 Notes on diluted earnings per share.

Issuance costs totaling $7.3 million were allocated pro rata based on the relative fair values of the liability and equity components. Issuance costs of $5.7 million attributable to the liability component were recorded as a direct deduction from the carrying value of the 2025 Notes and are being amortized to interest expense using the effective interest method over the term of the 2025 Notes. Issuance costs of $1.6 million attributable to the equity component were recorded as a charge to additional paid-in capital within stockholders’ equity, partially offset by the associated deferred tax effect of $0.4 million.

Convertible Senior Notes due 2023

On September 11, 2018, the Company issued $143.8 million aggregate principal amount of 2.375% Convertible Senior Notes Due 2023 (the “2023 Notes”) in a private placement to qualified institutional purchasers pursuant to an exemption from registration provided by Section 4(a)(2) and Rule 144A under the Securities Act. The net proceeds from the offerings, after deducting the initial purchasers’ discount and issuance costs of $4.4 million, were $139.4 million.

The 2023 Notes bear interest at a rate of 2.375% per year. Interest is payable in cash on March 15 and September 15 of each year, with the first payment made on March 15, 2019. The 2023 Notes mature on September 15, 2023, unless earlier converted, redeemed or repurchased in accordance with their terms prior to such date. The initial conversion rate is 26.5957 shares of the Company’s common stock per $1,000 principal amount of 2023 Notes, which is equivalent to an initial conversion price of approximately $37.60 per share of common stock. After consideration of the 2023 Notes Hedges (as defined below) and 2023 Notes Warrants (as defined below), the conversion rate is effectively hedged to a price of $46.62 per share of common stock. The conversion rate, and thus the conversion price, may be adjusted under certain circumstances as described in the indenture governing the 2023 Notes (the “2023 Indenture”). The Company may settle conversions by paying or delivering, as applicable, cash, shares of its common stock or a combination of cash and shares of its common stock, at the Company’s election, based on the applicable conversion rate(s). If a “make-whole fundamental change” (as defined in the 2023 Indenture) occurs, then the Company will in certain circumstances increase the conversion rate for a specified period of time. The Company’s intent is to settle the principal amount of the 2023 Notes in cash upon conversion.

During the quarter-ended September 30, 2020, the Company used a portion of the net cash proceeds from the 2025 Notes issuance to repurchase a portion of the outstanding 2023 Notes through individual, privately negotiated transactions (the “2023 Notes Partial Repurchase”), leaving 2023 Notes with aggregate principal amount of $12.5 million outstanding. The Company used $172.0 million of the net proceeds from the 2025 Notes issuance to complete the 2023 Notes Partial Repurchase, of which $120.9 million and $49.9 million were allocated to the liability and equity components of the 2023 Notes, respectively, and $1.3 million was related to the payment of interest. The cash consideration allocated to the liability component was based on the fair value of the liability component utilizing an effective discount rate of 5.2%. This rate was based on the Company’s estimated rate for a similar liability with the same maturity, but without the conversion option. To derive this effective discount rate, the Company observed the trading details of its 2023 Notes immediately prior to the repurchase date to determine the volatility of its 2023 Notes. The Company utilized the observed volatility to calculate the effective discount rate, which was adjusted to reflect the term of the remaining 2023 Notes. The cash consideration allocated to the equity component was calculated by deducting the fair value of the liability component and interest payment from the aggregate cash consideration. The $4.3 million loss on extinguishment was subsequently determined by comparing the allocated cash consideration with the carrying value of the liability component, which includes the proportionate amounts of unamortized debt discount and the remaining unamortized debt issuance costs of $2.3 million.

Other Terms of the Notes

The 2025 Notes and 2023 Notes (together, the “Notes”) may be converted at the holder’s option prior to the close of business on the business day immediately preceding August 1, 2025 and September 15, 2023 for the 2025 Notes and 2023 Notes, respectively, but only under the following circumstances:

•during any calendar quarter commencing after the calendar quarter ending on September 30, 2020 and December 31, 2018 for the 2025 Notes and 2023 Notes, respectively, if the last reported sale price per share of the Company’s common stock exceeds 130% of the applicable conversion price for each of at least 20 trading days during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter;

•during the five consecutive business days immediately after any 10 consecutive trading day period (such 10 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 per share of the Company’s common stock on such trading day and the applicable conversion rate on such trading day;

•upon the occurrence of certain corporate events or distributions on the Company’s common stock described in the 2025 Indenture or the 2023 Indenture, as applicable; and

•at any time from, and including, February 3, 2025 and March 15, 2023 for the 2025 Notes and 2023 Notes, respectively, until the close of business on the second scheduled trading day immediately before the applicable maturity date.

The Company may not redeem the Notes at its option before maturity. If a “fundamental change” (as defined in the 2025 Indenture or 2023 Indenture) occurs, then, except as described in the 2025 Indenture or 2023 Indenture, noteholders may require the Company to repurchase their Notes at a cash repurchase price equal to the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any.

As of September 30, 2020, none of the conditions permitting holders to convert their Notes had been satisfied and no shares of the Company’s common stock had been issued in connection with any conversions of the Notes. Based on the closing price of the Company's common stock of $42.74 per share on September 30, 2020, the conversion value of the 2025 Notes was less than the principal amount of the 2025 Notes outstanding on a per note basis, and the conversion value of the 2023 Notes was greater than the principal amount of the 2023 Notes outstanding on a per note basis.

The liability component of the 2025 Notes and 2023 Notes consisted of the following (in thousands):


	September 30, 2020 (unaudited)				December 31, 2019
Liability component:	2025 Notes		2023 Notes		2025 Notes		2023 Notes
Principal	$	230,000	$	12,510	$	—	$	143,750
Less: Unamortized debt discount	(47,827)		(1,137)		—		(16,033)
Unamortized debt issuance costs	(5,597)		(212)		—		(3,053)
Net carrying amount	$	176,576	$	11,161	$	—	$	124,664

Interest expense for the three and nine months ended September 30, 2020 and 2019 related to the 2025 Notes and 2023 Notes consisted of the following (in thousands):

2025 Notes


	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Coupon interest	$	375	$	—	$	375	$	—
Amortization of debt discount	1,116		—		1,116		—
Amortization of debt issuance costs	151		—		151		—
Total interest expense recognized	$	1,642	$	—	$	1,642	$	—

2023 Notes


	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Coupon interest	$	446	$	854	$	2,153	$	2,561
Amortization of debt discount	535		950		2,504		2,810
Amortization of debt issuance costs	110		206		522		618
Total interest expense recognized	$	1,091	$	2,010	$	5,179	$	5,989

Convertible Notes Hedges

In connection with the issuance of the 2025 Notes and 2023 Notes, the Company entered into privately negotiated convertible note hedge transactions (the “2025 Notes Hedges” and the “2023 Notes Hedges,” respectively, and together, the “Notes Hedges”) with certain of the initial purchasers or their respective affiliates and/or other financial institutions (the “Option Counterparties”). The 2025 Notes Hedges provide the Company with the option to acquire, on a net settlement basis, approximately 4.5 million shares of common stock at a strike price of $51.67, which is equal to the number of shares of common stock that notionally underlie the 2025 Notes and corresponds to the conversion price of the 2025 Notes. The 2023 Notes Hedges provide the Company with the option to acquire, on a net settlement basis, approximately 0.3 million shares (after consideration of the 2023 Notes Partial Repurchase) of common stock at a strike price of $37.60, which is equal to the number of shares of common stock that notionally underlie the 2023 Notes and corresponds to the conversion price of the 2023 Notes after the partial repurchase discussed above. If the Company elects cash settlement and exercises the 2025 Notes Hedges or the 2023 Notes Hedges, the aggregate amount of cash received from the Option Counterparties will cover the aggregate amount of cash that the Company would be required to pay to the holders of the Notes, less the principal amount thereof. The Notes Hedges do not meet the criteria for separate accounting as a derivative as they are indexed to the Company’s stock and are accounted for as freestanding financial instruments. Upon initial purchase, the 2025 Notes Hedges and 2023 Notes Hedges were recorded as a reduction in additional paid-in capital within stockholders’ equity of $48.9 million and $20.7 million, respectively, partially offset by the deferred tax effect of $12.6 million and $5.3 million, respectively. In August 2020, in connection with the 2023 Notes Partial Repurchase, the Company terminated 2023 Notes Hedges corresponding to approximately 3.5 million shares for cash proceeds of $47.3 million. The proceeds were recorded as an increase to additional paid-in capital within stockholders' equity.

Convertible Notes Warrants

In connection with the issuance of the 2025 Notes and 2023 Notes, the Company also sold net-share-settled warrants (the “2025 Notes Warrants” and the “2023 Notes Warrants,” respectively, and together, the “Notes Warrants”) in privately negotiated transactions with the Option Counterparties. The strike price of the 2025 Notes Warrants and 2023 Notes Warrants was approximately $81.05 and $46.62 per share, respectively, and is subject to certain adjustments under the terms of their respective Notes Warrants. As a result of the 2025 Notes Warrants and 2023 Notes Warrants and related transactions, the Company is required to recognize incremental dilution of earnings per share to the extent the average share price is over $81.05 for any fiscal quarter for the 2025 Notes Warrants and $46.62 for the 2023 Notes Warrants. The 2025 Notes Warrants and 2023 Notes Warrants expire over a period of 100 trading days commencing on November 1, 2025 and December 15, 2023, respectively, and may be settled in net shares of common stock or net cash at the Company’s election. Upon initial sale, the 2025 Notes Warrants and 2023 Notes Warrants were recorded as an increase in additional paid-in capital within stockholders’ equity of $22.2 million and $12.1 million, respectively. In August 2020, in connection with the 2023 Notes Partial Repurchase, the Company repurchased a portion of the 2023 Notes Warrants through a cash payment of $40.7 million. The repurchase was recorded as a reduction in additional paid-in capital within stockholders' equity.