
	December 31,
(in thousands)	2020		2019
9.25% Senior Secured Notes, due June 2023 (1)(2)	$	645,000	$	645,000
6.50% Senior Notes, due April 2021, net of current portion (3)	—		$	2,240
Unamortized discount and debt issuance costs (4)	(11,058)		(14,834)

Total long-term debt	633,942		632,406
Current portion of long-term debt (3)	2,240		—
Total long-term debt, including current portion	$	636,182	$	632,406

(2)The estimated fair value of total long-term debt outstanding was approximately $645.7 million and $673.8 million as of December 31, 2020 and 2019, respectively. This estimate of fair value is a Level 2 measurement as it was determined by quotations obtained from a broker-dealer who makes a market in these and similar securities.

(4)For the years ended December 31, 2020, 2019, and 2018, amortization of the discount on debt and amortization of deferred financing costs reported as Interest expense, net totaled approximately $3.8 million, $3.4 million, and $3.1 million, respectively.


(in thousands)	Total Capacity		Amount borrowed as of December 31, 2020		Outstanding Letters of Credit		Available capacity as of December 31, 2020		Maturity Date
ABL Credit Agreement (1)(2)	$	20,146	$	—	$	—	$	20,146	September 30, 2022

(1)At the option of the borrowers, loans under the ABL Credit Agreement initially bear interest at an annual rate equal to (i) 1.00% plus a base rate, Thereafter, loans will bear interest (i) at such rates if our quarterly excess availability is greater than 50% and (ii) 1.50% plus a base rate, otherwise.

(2)The ABL Credit Agreement was amended on September 29, 2020 to, among other things, reduce the commitments thereunder to $35 million and extended the maturity date to September 30, 2022. Deferred financing costs of $0.4 million were capitalized related to this amendment and will be amortized from Prepaid expenses and other current assets and Other long-term assets over the remaining term of the ABL Credit Agreement. Amortization expense was $0.2 million for the years ended December 31, 2020, 2019, and 2018.

On June 10, 2016, CVR Partners and CVR Nitrogen Finance Corporation (“CVR Nitrogen Finance”), an indirect wholly-owned subsidiary of CVR Partners (together the “2023 Notes Issuers”), certain subsidiary guarantors named therein and Wilmington Trust, National Association, as trustee and as collateral trustee, completed a private offering of $645 million aggregate principal amount of 9.25% Senior Secured Notes due 2023 (the “2023 Notes”). The 2023 Notes mature on June 15, 2023, unless earlier redeemed or repurchased by the issuers. Interest on the 2023 Notes is payable semi-annually in arrears on June 15 and December 15 of each year. The 2023 Notes are guaranteed on a senior secured basis by all of the Partnership’s existing subsidiaries.

On or after June 15, 2019, the 2023 Notes Issuers may on any one or more occasions, redeem all or part of the 2023 Notes at the redemption prices set forth below expressed as a percentage of the principal amount of the 2023 Notes plus accrued and unpaid interest to the applicable redemption date.

The 2023 Notes contain customary covenants for a financing of this type that, among other things, restrict CVR Partners’ ability and the ability of certain of its subsidiaries to: (i) sell assets; (ii) pay distributions on, redeem or repurchase the Partnership’s units or redeem or repurchase its subordinated debt; (iii) make investments; (iv) incur or guarantee additional indebtedness or issue preferred units; (v) create or incur certain liens; (vi) enter into agreements that restrict distributions or other payments from the Partnerships’ restricted subsidiaries to the Partnership; (vii) consolidate, merge or transfer all or substantially all of the Partnerships’ assets; (viii) engage in transactions with affiliates; and (ix) create unrestricted subsidiaries. In addition, the indenture contains customary events of default, the occurrence of which would result in or permit the trustee or the holders of at least 25% of the 2023 Notes to cause the acceleration of the 2023 Notes, in addition to the pursuit of other available remedies.

On September 29, 2020, CVR Partners amended the ABL Credit Agreement, a senior secured asset based revolving credit facility (the “ABL Credit Facility”) with a group of lenders and UBS AG (“UBS”), as administrative agent and collateral agent. The ABL Credit Amendment amended the aggregate principal amount of availability of up to $35 million with an incremental facility, which permits an increase in borrowings of up to $25 million in the aggregate subject to additional lender commitments and certain other conditions. The ABL Credit Amendment is scheduled to mature on September 30, 2022.