| Debt | Debt Credit Facility On September 5, 2019 , we entered into a $1.2 billion Amended and Restated Credit Agreement (the “Amended Credit Facility”) to amend and restate our previous credit facility, originally dated as of September 30, 2014 (as previously amended, the “2014 Credit Facility”). The Amended Credit Facility was entered into by and among the Company, the lenders from time to time party thereto (the “Lenders”), and Wells Fargo Bank, National Association, as administrative agent (the “Agent”). The Amended Credit Facility extends the maturity date of the 2014 Credit Facility from February 27, 2022 to September 5, 2024 (subject to early maturity provisions in certain circumstances, as described below), reduces our borrowing costs, provides additional borrowing capacity, and increases covenant flexibility. The Amended Credit Facility provides for the following: Revolving Facility: The Amended Credit Facility provides $600.0 million in aggregate commitments for secured revolving loans, with sublimits of $10.0 million for the issuance of letters of credit and $20.0 million for swingline loans (“Revolving Facility”). We have borrowed $230.0 million of revolving loans. Initial Term Loan: An initial term loan of $300.0 million was borrowed on the closing date for the Amended Credit Facility (the “Term Loan”). The proceeds of the Term Loan were used to repay the term loan balances outstanding under the 2014 Credit Facility. Delayed Draw Term Loan: In December 2019, we drew funds of $300.0 million available under the delayed draw term loan (“Delayed Draw Term Loan”). Revolving loans under the Amended Credit Facility may be voluntarily prepaid and re-borrowed. Principal payments on the Term Loan and Delayed Draw Term Loan (collectively, the “Term Loans”) are due in quarterly installments equal to an initial amount of $3.8 million , which increases to $7.5 million beginning on December 31, 2020 , increases to $11.3 million beginning on December 31, 2022 , and increases to $15.0 million beginning on December 31, 2023 . Once repaid or prepaid, the Term Loans may not be re-borrowed. All outstanding principal and accrued but unpaid interest is due, and the commitments for the Revolving Facility terminate, on the maturity date. The Term Loans are subject to mandatory repayment requirements in the event of certain asset sales or if certain insurance or condemnation events occur, subject to customary reinvestment provisions. We may prepay the Term Loans in whole or in part at any time without premium or penalty. Accordion Feature: The Amended Credit Facility also allows us, subject to certain conditions, to request additional term loan commitments and/or additional revolving commitments in an aggregate principal amount of up to the greater of $250.0 million or 100% of consolidated EBITDA (as defined within the agreement) for the most recent four fiscal quarters, plus an amount that would not cause our Senior Leverage Ratio, as defined below, to exceed 3.50 to 1.00 . All outstanding revolving loans and term loans under the Amended Credit Facility mature on September 5, 2024 . If on or prior to August 16, 2022, we have failed to demonstrate to the Agent that we would be in compliance with each financial covenant after giving pro forma effect to the repayment in full of the Convertible Notes which mature on November 15, 2022 , then the Amended Credit Facility will mature on August 16, 2022. In addition, if on any business day during the period beginning on August 16, 2022 until the Convertible Notes are paid in full, our available liquidity is less than an amount equal to 125% of the outstanding principal amount of the Convertible Notes, then amounts outstanding under the Amended Credit Facility are due the next business day. At our option, amounts outstanding under the Amended Credit Facility accrue interest at a per annum rate equal to either LIBOR, plus a margin ranging from 1.00% to 2.00% , or the Base Rate, plus a margin ranging from 0.00% to 1.00% (“Applicable Margin”). The base LIBOR is, at our discretion, equal to either one, three, or six month LIBOR. The Base Rate is defined as the greater of Wells Fargo's prime rate, the Federal Funds Rate plus 0.50% , or one month LIBOR plus 1.00% . In each case, the Applicable Margin is determined based upon our Net Leverage Ratio, as defined below. Accrued interest on amounts outstanding under the Amended Credit Facility is due and payable quarterly, in arrears, for loans bearing interest at the Base Rate and at the end of the applicable interest period in the case of loans bearing interest at the adjusted LIBOR. Unused commitments under the Revolving Facility are subject to a commitment fee to be paid in arrears on the last day of each fiscal quarter, ranging from 0.15% to 0.35% per annum determined based on our Net Leverage Ratio, as defined below. Certain of our existing and future material domestic subsidiaries are required to guarantee our obligations under the Amended Credit Facility, and the obligations under the Amended Credit Facility are secured by substantially all of our assets and the assets of the subsidiary guarantors. The Amended Credit Facility contains customary affirmative and negative covenants. The negative covenants limit our and our subsidiaries’ ability to, among other things, incur additional indebtedness, grant liens on our assets, make investments including acquisitions, dispose of assets, or pay dividends or distributions or repurchase our stock, subject in each case to customary exceptions and qualifications. Our covenants also include requirements that we comply with the following financial ratios: Consolidated Net Leverage Ratio : The Consolidated Net Leverage Ratio (“Net Leverage Ratio”), defined as a ratio of consolidated funded indebtedness less qualified cash and cash equivalents, each as defined in the Amended Credit Facility, on the last day of each fiscal quarter to the sum of the four previous consecutive fiscal quarters’ consolidated EBITDA, as defined in the Amended Credit Facility, of no greater than 5.00 to 1.00 (or, at our election following certain material acquisitions, 5.50 to 1.00 ). Consolidated Interest Coverage Ratio : The Consolidated Interest Coverage Ratio (“Interest Coverage Ratio”), defined as a ratio of the sum of the four previous fiscal quarters’ consolidated EBITDA to our interest expense for the same period, excluding non-cash interest attributable to the Convertible Notes, as defined below, of no less than 3.00 to 1.00 . Consolidated Senior Secured Net Leverage Ratio : The Consolidated Senior Secured Net Leverage Ratio (“Senior Leverage Ratio”), defined as a ratio of consolidated senior secured indebtedness less qualified cash and cash equivalents, each as defined in the Amended Credit Facility, on the last day of each fiscal quarter to the sum of the four previous consecutive fiscal quarters’ consolidated EBITDA, of no greater than 3.75 to 1.00 (or, at our election following certain material acquisitions, 4.25 to 1.00 ). As of March 31, 2020 , we were in compliance with the covenants under our Amended Credit Facility. The Amended Credit Facility contains customary events of default, subject to customary cure periods for certain defaults. In the event of a default, the obligations under the Amended Credit Facility could be accelerated, the applicable interest rate could be increased, the loan commitments could be terminated, our subsidiary guarantors could be required to pay the obligations in full and our lenders would be permitted to exercise remedies with respect to all of the collateral that is securing the Amended Credit Facility. Any such default that is not cured or waived could have a material adverse effect on our liquidity and financial condition. As of March 31, 2020 and December 31, 2019 , we had $370.0 million of available credit under our Revolving Facility. Principal outstanding for the Revolving Facility was $230.0 million for each period. We incur commitment fees on the unused portion of the Revolving Facility. The carrying value of the Revolving Facility approximates its fair value. Unamortized debt issuance costs for the revolving facilities were $2.5 million and $2.7 million at March 31, 2020 and December 31, 2019 , respectively, and are included in the line “Other assets” in the Condensed Consolidated Balance Sheets. Principal outstanding and unamortized debt issuance and discount costs for the Term Loans were as follows at March 31, 2020 and December 31, 2019 : March 31, 2020 December 31, 2019 Term Loans (in thousands) Principal outstanding $ 592,500 $ 596,250 Unamortized issuance costs (887 ) (942 ) Unamortized discount (1,171 ) (1,245 ) Carrying value $ 590,442 $ 594,063 The fair value of the Term Loans on March 31, 2020 and December 31, 2019 was $539.7 million and $582.7 million , respectively. The fair value was estimated by discounting future cash flows using prevailing market interest rates on debt with similar creditworthiness, terms, and maturities. We concluded that this fair value measurement should be categorized within Level 2. Future maturities of principal under the Term Loans are as follows for the years ending December 31, in thousands: Term Loans 2020 $ 15,000 2021 30,000 2022 33,750 2023 24,375 Thereafter 489,375 $ 592,500 Convertible Notes In May 2017 , we issued convertible senior notes with aggregate principal of $345.0 million (including the underwriters’ exercise in full of their over-allotment option of $45.0 million ) which mature on November 15, 2022 (“Convertible Notes”). The Convertible Notes were issued under an indenture dated May 23, 2017 (“Indenture”), by and between us and Wells Fargo Bank, N.A., as Trustee. We received net proceeds from the offering of approximately $304.2 million after adjusting for debt issuance costs, including the underwriting discount, the net cash used to purchase the Note Hedges, as defined below, and the proceeds from the issuance of the Warrants which are discussed below. The Convertible Notes accrue interest at a rate of 1.50% , payable semi-annually on May 15 and November 15 of each year. On or after May 15, 2022 , and until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their Convertible Notes at their option. The Convertible Notes are convertible at an initial rate of 23.84 shares per $1,000 of principal (equivalent to an initial conversion price of approximately $41.95 per share of our common stock). The conversion rate is subject to customary adjustments for certain events as described in the Indenture. Upon conversion, we will pay or deliver, as the case may be, cash, shares of our common stock or a combination of cash and shares of our common stock, at our election. It is our current intent to settle conversions of the Convertible Notes through combination settlement, which involves repayment of the principal portion in cash and any excess of the conversion value over the principal amount in shares of our common stock. Based on our closing stock price of $52.93 on March 31, 2020 , the if-converted value exceeded the aggregate principal amount of the Convertible Notes by $90.3 million . Holders may convert their Convertible Notes, at their option, prior to May 15, 2022 only under the following circumstances: • during any calendar quarter commencing after the calendar quarter ending on June 30, 2017 (and only during such calendar quarter), if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; • during the five business day period after any five consecutive trading day period (the “Measurement Period”) in which the trading price per $1,000 principal amount of the Convertible Notes for each trading day of the Measurement Period was less than 98% of the product of the last reported sales price of our common stock and the conversion rate on each such trading day; or • upon the occurrence of specified corporate events, as defined in the Indenture. We may not redeem the Convertible Notes prior to their maturity date, and no sinking fund is provided for them. If we undergo a fundamental change, as described in the Indenture, subject to certain conditions, holders may require us to repurchase for cash all or any portion of their Convertible Notes. The fundamental change repurchase price is equal to 100% of the principal amount of the Convertible Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. If holders elect to convert their Convertible Notes in connection with a make-whole fundamental change, as described in the Indenture, we will, to the extent provided in the Indenture, increase the conversion rate applicable to the Convertible Notes. The Convertible Notes are senior unsecured obligations and rank senior in right of payment to any of our indebtedness that is expressly subordinated in right of payment to the Convertible Notes and equal in right of payment to any of our existing and future unsecured indebtedness that is not subordinated. The Convertible Notes are effectively junior in right of payment to any of our secured indebtedness (to the extent of the value of assets securing such indebtedness) and structurally junior to all existing and future indebtedness and other liabilities, including trade payables, of our subsidiaries. The Indenture does not limit the amount of debt that we or our subsidiaries may incur. The Convertible Notes are not guaranteed by any of our subsidiaries. The Indenture does not contain any financial or operating covenants or restrictions on the payments of dividends, the incurrence of indebtedness, or the issuance or repurchase of securities by us or any of our subsidiaries. The Indenture contains customary events of default with respect to the Convertible Notes and provides that upon certain events of default occurring and continuing, the Trustee may, and the Trustee at the request of holders of at least 25% in principal amount of the Convertible Notes shall, declare all of principal and accrued and unpaid interest, if any, of the Convertible Notes to be due and payable. In case of certain events of bankruptcy, insolvency or reorganization involving us or a significant subsidiary, all of the principal of and accrued and unpaid interest on the Convertible Notes will automatically become due and payable. In accounting for the issuance of the Convertible Notes, we separated the Convertible Notes into liability and equity components. We allocated $282.5 million of the Convertible Notes to the liability component, and $62.5 million to the equity component. The excess of the principal amount of the liability component over its carrying amount is amortized to interest expense over the term of the Convertible Notes using the effective interest method. The equity component will not be remeasured as long as it continues to meet the conditions for equity classification. We incurred issuance costs of $9.8 million related to the Convertible Notes. Issuance costs were allocated to the liability and equity components based on their relative values. Issuance costs attributable to the liability component are being amortized to interest expense over the term of the Convertible Notes, and issuance costs attributable to the equity component are included along with the equity component in stockholders' equity. During 2019 , we received conversion notices from certain holders with respect to an immaterial amount in aggregate principal of Convertible Notes requesting conversion as a result of the sales price condition having been met during the second quarter of 2019. In accordance with the terms of the Convertible Notes, we made cash payments of the aggregate principal amount and delivered newly issued shares of our common stock for the remainder of the conversion obligation in excess of the aggregate principal amount of the Convertible Notes being converted, in full satisfaction of such converted notes. We received shares of our common stock under the Note Hedges that offset the issuance of shares of common stock upon conversion of the Convertible Notes . The net carrying amount of the Convertible Notes at March 31, 2020 and December 31, 2019 , was as follows: March 31, 2020 December 31, 2019 (in thousands) Liability component: Principal amount $ 344,995 $ 344,995 Unamortized discount (32,449 ) (35,287 ) Unamortized debt issuance costs (4,157 ) (4,520 ) Convertible notes, net $ 308,389 $ 305,188 Equity component, net of issuance costs and deferred tax: $ 61,390 $ 61,390 The estimated fair value of the Convertible Notes at March 31, 2020 and December 31, 2019 was $477.1 million and $486.7 million , respectively. The estimated fair value is based on quoted market prices as of the last trading day for the three months ended March 31, 2020 ; however, the Convertible Notes have only a limited trading volume and, as such, this fair value estimate is not necessarily the value at which the Convertible Notes could be retired or transferred. We concluded this measurement should be classified within Level 2. The following table sets forth total interest expense related to the Convertible Notes for the three months ended March 31, 2020 and 2019 : Three Months Ended March 31, 2020 2019 (in thousands) Contractual interest expense $ 1,294 $ 1,294 Amortization of debt discount 2,838 2,676 Amortization of debt issuance costs 363 343 $ 4,495 $ 4,313 The effective interest rate of the liability component for the three months ended March 31, 2020 and 2019 was 5.87% . Convertible Note Hedges and Warrants On May 23, 2017 , we entered into privately negotiated transactions to purchase hedge instruments (“Note Hedges”), covering approximately 8.2 million shares of our common stock at a cost of $62.5 million . The Note Hedges are subject to anti-dilution provisions substantially similar to those of the Convertible Notes, have a strike price of approximately $41.95 per share, are exercisable by us upon any conversion under the Convertible Notes, and expire on November 15, 2022 . The Note Hedges are generally expected to reduce the potential dilution to our common stock (or, in the event the conversion is settled in cash, to reduce our cash payment obligation) in the event that at the time of conversion our stock price exceeds the conversion price under the Convertible Notes. The cost of the Note Hedges is expected to be tax deductible as an original issue discount over the life of the Convertible Notes, as the Convertible Notes and the Note Hedges represent an integrated debt instrument for tax purposes. The cost of the Note Hedges was recorded as a reduction of our additional paid-in capital in the accompanying Condensed Consolidated Financial Statements. As discussed above, an insignificant number of Note Hedges were exercised during 2019 upon the conversion of the Convertible Notes, thereby offsetting the issuance of our common stock for such conversion. On May 23, 2017 , we also sold warrants for the purchase of up to 8.2 million shares of our common stock for aggregate proceeds of $31.5 million (“Warrants”). The Warrants have a strike price of $57.58 per share and are subject to customary anti-dilution provisions. The Warrants will expire in ratable portions on a series of expiration dates commencing on February 15, 2023 . The proceeds from the issuance of the Warrants were recorded as an increase to our additional paid-in capital in the accompanying Condensed Consolidated Financial Statements. |
