	December 31,
	2020			2019
	(In Thousands)
Working Capital Revolver Loan, with a current interest rate of 3.75% (A)	$	—		$	—
Senior Secured Notes due 2023 (B)		435,000			435,000
Secured Promissory Note due 2021, with an interest rate of 5.25% (C)		1,221			4,746
Unsecured Loan Agreement due 2022, with an interest rate of 1.00% (D)		10,000			—
Secured Financing due 2023, with an interest rate of 8.32% (E)		10,715			13,476
Secured Loan Agreement due 2025, with an interest rate of 8.75% (F)		6,834			5,219
Secured Financing due 2025, with an interest rate of 8.75% (G)		28,636			—
Secured Promissory Note due 2023 (G)		—			12,705
Other		432			159
Unamortized discount, net of premium and debt issuance costs		(8,648	)		(12,261	)
		484,190			459,044
Less current portion of long-term debt (H)		16,801			9,410
Long-term debt due after one year, net (H)	$	467,389		$	449,634

(A) Our revolving credit facility, as amended (the “Working Capital Revolver Loan”), provides for advances up to $65 million (the “Maximum Revolver Amount”), based on specific percentages of eligible accounts receivable and inventories and up to $10 million of letters of credit, the outstanding amount of which reduces the available for borrowing under the Working Capital Revolver Loan. At December 31, 2020, our available borrowings under our Working Capital Revolver Loan were approximately $41.8 million, based on our eligible collateral, less outstanding letters of credit and loan balance. The maturity date of the Working Capital Revolver Loan is on the earlier of (i) the date that is 90 days prior to the earliest stated maturity date of the Senior Secured Notes (unless refinanced or repaid) and (ii) February 26, 2024. Subject to certain conditions and subject to lender approval, the Maximum Revolver Amount may increase up to an additional $10 million, less the outstanding aggregate principal amount of the unforgiven portion (as defined in the agreement) of the PPP loan discussed below within footnote (D). 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 quarterly, 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.

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 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.

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. A portion of the 2018 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 $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.

(C) El Dorado Chemical Company (“EDC”), one of our subsidiaries, is party to a secured promissory note due in March 2021. Principal and interest are payable in monthly installments.

(D) In April 2020, LSB entered into a federally guaranteed loan agreement (“PPP loan”) for $10 million with a lender pursuant to a new loan program through the U.S. Small Business Administration (“SBA”) as the result of the Paycheck Protection Program (“PPP”) established by the Coronavirus Aid, Relief, and Economic Security (“CARES”) Act and amended by the Paycheck Protection Program Flexibility Act of 2020. We applied ASC 470, Debt, to account for the PPP loan. We have used all or substantially all of the proceeds from the PPP loan for payroll, rent, utilities, and other specified costs that qualify for loan forgiveness. Under the current terms of the PPP loan, loan forgiveness applications are due within 10 months after the end of the loan forgiveness covered period, which period began on the date the PPP loan was disbursed and ends either 8-weeks or 24-weeks after disbursement of the loan. Once the SBA notifies the lender the amount of the loan which has been approved for forgiveness, the lender will determine the date that the equal monthly principal and interest payments will begin for the remaining loan balance, if any. Currently, the loan matures in April 2022, which term may be extended to April 2025 if mutually agreed to by the parties. As for the potential loan forgiveness, once the PPP loan is, wholly or partially, forgiven and a legal release is received, the liability would be reduced by the amount forgiven and a gain on extinguishment would be recorded.

(E) During 2019, EDC entered into a secured financing arrangement with an affiliate of LSB Funding L.L.C. (“LSB Funding”). Principal and interest are payable in 48 equal monthly installments with a final balloon payment of approximately $3 million due in June 2023. A portion of the proceeds from this secured financing arrangement was used to pay off a secured promissory note that was scheduled to mature in 2019.

(F) During 2019, EDC entered into an interim secured loan agreement with an affiliate of LSB Funding, which provided for 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 was payable in monthly installments. Effective February 28, 2020, the Interim Loan Period ended, and the Interim Loan was replaced by a secured loan agreement due in March 2025. Under the terms of the loan, principal and interest will be payable in 60 equal monthly installments.

(G) In August 2020, El Dorado Ammonia L.L.C. (“EDA”), one of our subsidiaries, entered into a $30 million secured financing arrangement with an affiliate of LSB Funding. Beginning in September 2020, principal and interest are payable in 60 equal monthly installments with a final balloon payment of approximately $5 million due in August 2025. This financing arrangement is secured by an ammonia storage tank 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 May 2023.

(H) Maturities of long-term debt for each of the five years after December 31, 2020 are as follows (in thousands):

2021	$	16,893
2022		12,641
2023		446,291
2024		7,427
2025		9,586
Thereafter		—
Less: Discount, net of premium, and debt issuance costs		8,648
	$	484,190