Long-term Debt

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.

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 December 31, 2018, the Company had one outstanding letter 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 (5.50% on December 31, 2018) plus a margin ranging from 0.00% to 0.50% or one-month LIBOR (2.50% on December 31, 2018) 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 December 31, 2018, 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 December 31, 2018, the Company was in compliance with all covenants under the Credit Agreement.

Convertible Senior Notes due 2023

On September 11, 2018, the Company issued $143.8 million aggregate principal amount of the 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 net proceeds from the offerings, after deducting the initial purchasers’ discount and issuance costs of $4.4 million, were $139.4 million. The Company used (i) $49.0 million of the net proceeds to pay down the Company’s revolving credit facility, (ii) $38.8 million of the net proceeds to repurchase 1.3 million shares of the Company’s common stock concurrently with the pricing of the Notes offering in privately negotiated transactions and (iii) $8.6 million of the net proceeds to fund the cost of entering into the Notes Hedges (as defined below), after such cost was partially offset by the proceeds that the Company received from entering into the Notes Warrants (as defined below). The remaining proceeds will be used for working capital or other general corporate purposes.

The Notes bear interest at a rate of 2.375% per year. Interest will be payable in cash on March 15 and September 15 of each year, beginning March 15, 2019. The 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 Notes, which is equivalent to an initial conversion price of approximately $37.60 per share of common stock. After consideration of the Notes Hedges and Notes Warrants, 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 Notes (the “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 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 Notes in cash upon conversion.

A Note may be converted at the holder’s option prior to the close of business on the business day immediately preceding September 15, 2023, but only under the following circumstances:


•	during any calendar quarter commencing after the calendar quarter ending on December 31, 2018, if the last reported sale price per share of the Company’s common stock exceeds 130% of the 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 conversion rate on such trading day;


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


•	at any time from, and including, March 15, 2023 until the close of business on the second scheduled trading day immediately before the maturity date.

The Company may not redeem the Notes at its option before maturity. If a “fundamental change” (as defined in the Indenture) occurs, then, except as described in the 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 December 31, 2018, 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 our common stock of $22.26 per share on December 31, 2018, the conversion value of the Notes was less than the principal amount of the Notes outstanding on a per Note basis.

In accordance with accounting for debt with conversion and other options, the Company bifurcated the principal amount of the Notes into liability and equity components. The initial liability component of the Notes was valued at $122.9 million based on the contractual cash flows discounted at an appropriate comparable market non-convertible debt borrowing rate at the date of issuance of 5.7%. 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 $20.9 million, partially offset by the associated deferred tax effect of $5.4 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 $20.9 million is being amortized to interest expense using the effective interest method with an effective interest rate of 5.7% over the period from the issuance date through the contractual maturity date of September 15, 2023. The Company utilizes the treasury stock method to calculate the effects of the Notes on diluted earnings per share.

Issuance costs totaling $4.8 million were allocated pro rata based on the relative fair values of the liability and equity components. Issuance costs of $4.1 million attributable to the liability component were recorded as a direct deduction from the carrying value of the Notes and are being amortized to interest expense using the effective interest method over the term of the Notes. Issuance costs of $0.7 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 $0.2 million. The unamortized issuance costs are being amortized over a weighted-average remaining period of approximately five years.

The liability and equity components of the Notes consisted of the following (in thousands):



	As of December 31, 2018
Liability component:
Principal	$	143,750
Less: Unamortized debt discount	(19,806		)
Unamortized debt issuance costs	(3,877		)
Net carrying amount	$	120,067

Equity component:
Debt discount for conversion option, net of taxes	$	15,547
Less: Issuance costs, net of taxes	(523		)
Net carrying amount	$	15,024

Interest expense for the year ended December 31, 2018 related to the Notes consisted of the following (in thousands):



	Year Ended December 31, 2018
Coupon interest	$	1,043
Amortization of debt discount	1,111
Amortization of debt issuance costs	252
Total interest expense recognized	$	2,406

2023 Convertible Notes Hedges

In connection with the issuance of the Notes, the Company entered into privately negotiated convertible note hedge transactions (the “Notes Hedges”) with certain of the initial purchasers or their respective affiliates and/or other financial institutions (the “Option Counterparties”). The Notes Hedges provide the Company with the option to acquire, on a net settlement basis, approximately 3.8 million shares 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 Notes and corresponds to the conversion price of the Notes. If the Company elects cash settlement and exercises the 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. The Notes Hedges were recorded as a reduction in additional paid-in capital within stockholders’ equity of $20.7 million, partially offset by the deferred tax effect of $5.3 million.

2023 Convertible Notes Warrants

In connection with the issuance of the Notes, the Company also sold net-share-settled warrants (the “Notes Warrants”) in privately negotiated transactions with the Option Counterparties. The strike price of the Notes Warrants was approximately $46.62 per share, and is subject to certain adjustments under the terms of the Notes Warrants. As a result of the 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 $46.62 for any fiscal quarter. The Notes Warrants expire over a period of 100 trading days commencing on December 15, 2023 and may be settled in net shares of common stock or net cash at the Company’s election. The Notes Warrants were recorded as an increase in additional paid-in capital within stockholders’ equity of $12.1 million.