	December 31,
	2019			2018
	(In Thousands)
Working Capital Revolver Loan, with a current interest rate of 5.25% (A)	$	—		$	10,000
Senior Secured Notes due 2023 (B)		435,000			400,000
Secured Promissory Note due 2021, with an interest rate of 5.25% (C)		4,746			8,090
Secured Promissory Note due 2023, with a current interest rate of 6.03% (D)		12,705			14,685
Secured Financing due 2023, with an interest rate of 8.32% (E)		13,476			—
Secured Loan Agreement, with an interest rate of 8.76% (E)		5,219			—
Secured Promissory Note due 2019 (E)		—			7,165
Other		159			221
Unamortized discount, net of premium, and debt issuance costs		(12,261	)		(14,962	)
		459,044			425,199
Less current portion of long-term debt (F)		9,410			12,518
Long-term debt due after one year, net (F)	$	449,634		$	412,681

(A) As amended in February 2019, our revolving credit facility (the “Working Capital Revolver Loan”) provides for advances up to $75 million, based on specific percentages of eligible accounts receivable and inventories and up to $10 million of standby letters of credit, the outstanding amount of which reduces the available for borrowing under the Working Capital Revolver Loan. At December 31, 2019, our available borrowings under our Working Capital Revolver Loan were approximately $42.1 million, based on our eligible collateral, less outstanding letters of credit. The maturity date of the Working Capital Revolver Loan is February 26, 2024. The Working Capital Revolver Loan also provides for a springing financial covenant (the “Financial Covenant”), which requires that, if the borrowing availability is less than 10.0% of the total revolver commitments, then the borrowers must maintain a minimum fixed charge coverage ratio of not less than 1.00 to 1.00. The Financial Covenant, if triggered, is tested monthly.

Interest accrues on outstanding borrowings under the Working Capital Revolver Loan at a rate equal to, at our election, either (a) LIBOR for an interest period selected by us plus an applicable margin equal to 1.50% per annum or 1.75% per annum, depending on borrowing availability under the Working Capital Revolver Loan, or (b) Wells Fargo Capital Finance’s prime rate plus an applicable margin equal to 0.50% per annum or 0.75% per annum, depending on borrowing availability under the Working Capital Revolver Loan. Interest is paid monthly, if applicable.

The Working Capital Revolver Loan contains customary covenants including limitations on asset sales, liens, debt incurrence, restricted payments, investments, dividends and transactions with affiliates.

The Working Capital Revolver Loan includes customary events of default. Upon the occurrence of any event of default, the obligations under the Working Capital Revolver Loan may be accelerated and the revolver commitments may be terminated.

Obligations under the Working Capital Revolver Loan are secured by a first priority security interest in substantially all of our current assets, including accounts receivable and inventory, subject to certain customary exceptions.

(B) On April 25, 2018, LSB completed the issuance and sale of $400 million aggregate principal amount of its 9.625% Senior Secured Notes due 2023 (the “Notes”). The Notes were issued pursuant to an indenture, dated as of April 25, 2018 (the “Indenture”), by and among LSB, the subsidiary guarantors named therein, and Wilmington Trust, National Association, a national banking association, as trustee and collateral agent (the “Notes Trustee”). The Notes were issued at a price equal to 99.509% of their face value.

On June 21, 2019, LSB completed the issuance and sale of $35 million aggregate principal amount of its 9.625% Senior Secured Notes due 2023 (the “New Notes”). The New Notes were issued pursuant to the Indenture (the Notes together with the New Notes, the “Senior Secured Notes”). The New Notes were issued at a price equal to 102.125% of their face value, plus accrued interest from May 1, 2019 to June 21, 2019, in a transaction exempt from the registration requirements under the Securities Act of 1933 (the “Securities Act”) sold to eligible purchasers in reliance on Rule 144A under the Securities Act and to non-U.S. persons in accordance with Regulation S under the Securities Act.

As it relates to the issuance of the Notes in April 2018, a portion of the net proceeds from the Notes were used to purchase/redeem the $375 million aggregate principal amount of senior secured notes scheduled to mature in 2019. The remaining net proceeds were primarily used to pay related transaction fees and expenses, redemption premiums, and accrued interest on the senior secured notes purchased/redeemed.

A portion of this transaction was accounted for as an extinguishment of debt and a portion was accounted for as a non-substantial debt modification. As a result, approximately $15.2 million of the fees/redemption premiums/discount was deferred and included in discount and debt issuance costs and approximately $0.9 million of fees were expensed, as incurred, and are included in interest expense in 2018. In addition, we recognized a loss on extinguishment of debt of approximately $6.0 million in 2018, primarily consisting of a portion of the redemption premiums paid and the expensing of a portion of debt issuance costs associated with the senior secured notes.

The Senior Secured Notes will mature on May 1, 2023 and rank senior in right of payment to all of our debt that is expressly subordinated in right of payment to the notes and will rank pari passu in right of payment with all of our liabilities that are not so subordinated, including the Working Capital Revolver Loan. LSB’s obligations under the Senior Secured Notes are jointly and severally guaranteed by the subsidiary guarantors named in the Indenture on a senior secured basis.

Interest on the Senior Secured Notes accrues at a rate of 9.625% per annum and is payable semi-annually in arrears on May 1 and November 1 of each year.

LSB may redeem the Senior Secured Notes at its option, in whole or in part, subject to the payment of a premium ranging from a “make-whole” premium to a premium of 3.609% of the principal amount so redeemed, in the case of any optional redemption prior to May 1, 2022. If LSB experiences a change of control, it must offer to purchase the notes at 101% of their principal amount, plus accrued and unpaid interest, if any, to but excluding the date of purchase.

The Indenture contains covenants that limit, among other things, LSB and certain of its subsidiaries’ ability to (1) incur additional indebtedness; (2) declare or pay dividends, redeem stock or make other distributions to stockholders; (3) make other restricted payments, including investments; (4) create dividend and other payment restrictions affecting its subsidiaries; (5) create liens or use assets as security in other transactions; (6) merge or consolidate, or sell, transfer, lease or dispose of all or substantially all of our assets; and (7) enter into transactions with affiliates. Further, during any such time when the Senior Secured Notes are rated investment grade by each of Moody’s Investors Service, Inc. and Standard & Poor’s Investors Ratings Services and no Default (as defined in the Indenture) has occurred and is continuing, certain of the covenants will be suspended with respect to the Senior Secured Notes.

The Indenture provides for customary events of default (subject in certain cases to customary grace and cure periods), which include nonpayment, breach of covenants in the Indenture, payment defaults or acceleration of other indebtedness, a failure to pay certain judgments and certain events of bankruptcy and insolvency.

Obligations in respect of the Senior Secured Notes are secured by a first priority security interest in substantially all of our fixed assets, subject to certain customary exceptions.

(C) EDC is party to a secured promissory note due in March 2021. Principal and interest are payable in monthly installments.

(D) El Dorado Ammonia L.L.C. (“EDA”), one of our subsidiaries, is party to a secured promissory note due in May 2023. Principal and interest are payable in equal monthly installments with a final balloon payment of approximately $6.1 million.

(E) On May 28, 2019, EDC entered into a $15 million secured financing arrangement with an affiliate of LSB Funding L.L.C. (“LSB Funding”). Beginning in June 2019, principal and interest are payable in 48 equal monthly installments with a final balloon payment of approximately $3 million due on June 1, 2023. This financing arrangement is secured by the cogeneration facility equipment and is guaranteed by LSB. A portion of the proceeds from this secured financing arrangement was used to pay off the Secured Promissory Note that was scheduled to mature in June 2019.

During 2019, EDC entered into a secured loan agreement with an affiliate of LSB Funding. Under the terms of the agreement, EDC has up to $7.5 million of available borrowings (the “Interim Loan”) during the construction of certain equipment (the “Interim Loan Period), subject to certain conditions. During the Interim Loan Period, interest only is payable in monthly installments. The Interim Loan will be replaced by a term loan in 2020. Principal and interest will be payable in 60 equal monthly installments under the term loan.

(F) Maturities of long-term debt for each of the five years after December 31, 2019 are as follows (in thousands):

2020	$	9,447
2021		7,598
2022		6,769
2023		447,491
2024		—
Thereafter		—
Less: Discount, net of premium, and debt issuance costs		12,261
	$	459,044