A summary of the carrying amounts of our debt follows:



	June 30, 2020			December 31, 2019
Senior secured credit facility	$	328,000		$	205,000
Promissory note due 2024	3,590			3,853
Total long-term debt	$	331,590		$	208,853
Current maturities of long-term debt	(536		)	(529		)
Long-term debt, net of current portion	$	331,054		$	208,324

In September 2014, the Company issued $250 million principal amount of 1.25% convertible senior notes due 2019 (the “Convertible Notes”) in a private offering. The Convertible Notes were governed by the terms of an indenture between the Company and U.S. Bank National Association, as Trustee (the “Indenture”). The Convertible Notes were senior unsecured obligations of the Company and paid interest semi-annually on April 1 and October 1 of each year at an annual rate of 1.25%.

Prior to maturity, upon conversion, the Convertible Notes would have been settled, at our election, in cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock. Our intent and policy was to settle conversions with a combination of cash and shares of common stock with the principal amount of the Convertible Notes paid in cash, in accordance with the settlement provisions of the Indenture.

Upon issuance, we separated the Convertible Notes into liability and equity components. The carrying value of the equity component representing the conversion option, which was recognized as a debt discount, was determined by deducting the fair value of the liability component from the proceeds of the Convertible Notes. The debt discount was amortized to interest expense using an effective interest rate of 4.751% over the term of the Convertible Notes. The equity component was not remeasured as it continued to meet the conditions for equity classification.

The transaction costs related to the issuance of the Convertible Notes were separated into liability and equity components based on their relative values. Transaction costs attributable to the liability component were recorded as a deduction to the carrying amount of the liability and amortized to interest expense over the term of the Convertible Notes; and transaction costs attributable to the equity component were netted with the equity component of the Convertible Notes in stockholders’ equity.

The following table presents the amount of interest expense recognized related to the Convertible Notes for the periods presented.



	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
Contractual interest coupon	$	781	$	1,563
Amortization of debt discount	2,145		4,265
Amortization of debt issuance costs	315		630
Total interest expense	$	3,241	$	6,458

In connection with the issuance of the Convertible Notes, we entered into convertible note hedge transactions and warrant transactions. The convertible note hedge transactions were intended to reduce the potential future economic dilution associated with the conversion of the Convertible Notes and, combined with the warrants, effectively raised the price at which economic dilution would occur from the initial conversion price of approximately $79.89 to approximately $97.12 per share. The convertible note hedge transactions expired in the third quarter of 2019. The holders of the warrants have the option to purchase an initial total of approximately 3.1 million shares of the Company’s common stock at a strike price of approximately $97.12. The warrants expired on May 28, 2020. If the average market value per share of our common stock for the reporting period exceeded the strike price of the warrants, the warrants would have had a dilutive effect on our earnings per share. The warrants were separate transactions and were not part of the terms of the Convertible Notes or the convertible note hedge transactions.

The Company has a $600 million senior secured revolving credit facility, subject to the terms of a Second Amended and Restated Credit Agreement dated as of March 31, 2015, as amended to date (as amended and modified the "Amended Credit Agreement"), that becomes due and payable in full upon maturity on September 27, 2024. The Amended Credit Agreement provides the option to increase the revolving credit facility or establish term loan facilities in an aggregate amount of up to $150 million, subject to customary conditions and the approval of any lender whose commitment would be increased, resulting in a maximum available principal amount under the Amended Credit Agreement of $750 million. The initial borrowings under the Amended Credit Agreement were used to refinance borrowings outstanding under a prior credit agreement, and future borrowings under the Amended Credit Agreement may be used for working capital, capital expenditures, acquisitions of businesses, share repurchases, and general corporate purposes.

Fees and interest on borrowings vary based on our Consolidated Leverage Ratio (as defined in the Amended Credit Agreement). At our option, borrowings under the Amended Credit Agreement will bear interest at one, two, three or six-month LIBOR or an alternate base rate, in each case plus the applicable margin. The applicable margin will fluctuate between 1.125% per annum and 1.875% per annum, in the case of LIBOR borrowings, or between 0.125% per annum and 0.875% per annum, in the case of base rate loans, based upon our Consolidated Leverage Ratio at such time.

Amounts borrowed under the Amended Credit Agreement may be prepaid at any time without premium or penalty. We are required to prepay the amounts outstanding under the Amended Credit Agreement in certain circumstances, including upon an Event of Default (as defined in the Amended Credit Agreement). In addition, we have the right to permanently reduce or terminate the unused portion of the commitments provided under the Amended Credit Agreement at any time.

The loans and obligations under the Amended Credit Agreement are secured pursuant to a Second Amended and Restated Security Agreement and a Second Amended and Restated Pledge Agreement (as amended, the “Pledge Agreement”) with Bank of America, N.A. as collateral agent, pursuant to which the Company and the subsidiary guarantors grant Bank of America, N.A., for the ratable benefit of the lenders under the Amended Credit Agreement, a first-priority lien, subject to permitted liens, on substantially all of the personal property assets of the Company and the subsidiary guarantors, and a pledge of 100% of the stock or other equity interests in all domestic subsidiaries and 65% of the stock or other equity interests in each “material first-tier foreign subsidiary” (as defined in the Pledge Agreement).

The Amended Credit Agreement contains usual and customary representations and warranties; affirmative and negative covenants, which include limitations on liens, investments, additional indebtedness, and restricted payments; and two quarterly financial covenants as follows: (i) a maximum Consolidated Leverage Ratio (defined as the ratio of debt to consolidated EBITDA) of 3.75 to 1.00; however the maximum permitted Consolidated Leverage Ratio will increase to 4.00 to 1.00 upon the occurrence of certain transactions, and (ii) a minimum Consolidated Interest Coverage Ratio (defined as the ratio of consolidated EBITDA to interest) of 3.50 to 1.00. Consolidated EBITDA for purposes of the financial covenants is calculated on a continuing operations basis and includes adjustments to add back non-cash goodwill impairment charges, share-based compensation costs, certain non-cash restructuring charges, pro forma historical EBITDA for businesses acquired, and other specified items in accordance with the Amended Credit Agreement. For purposes of the Consolidated Leverage Ratio,

total debt is on a gross basis and is not netted against our cash balances. At June 30, 2020, we were in compliance with these financial covenants with a Consolidated Leverage Ratio of 2.60 to 1.00 and a Consolidated Interest Coverage Ratio of 14.07 to 1.00.

Borrowings outstanding under the Amended Credit Agreement at June 30, 2020 totaled $328.0 million. These borrowings carried a weighted average interest rate of 2.7%, including the effect of the interest rate swaps described in Note 9 “Derivative Instruments and Hedging Activity." Borrowings outstanding under the Amended Credit Agreement at December 31, 2019 were $205.0 million and carried a weighted average interest rate of 3.0%, including the effect of the interest rate swap outstanding at the time and described in Note 9 “Derivative Instruments and Hedging Activity." The borrowing capacity under the revolving credit facility is reduced by any outstanding borrowings under the revolving credit facility and outstanding letters of credit. At June 30, 2020, we had outstanding letters of credit totaling $1.7 million, which are primarily used as security deposits for our office facilities. As of June 30, 2020, the unused borrowing capacity under the revolving credit facility was $270.3 million.