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Long-Term Debt | Dec. 31, 2020
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Debt Disclosure [Abstract] |
Long-Term Debt | Note 5 – Long-Term Debt The following table summarizes the Company’s total outstanding balance on its revolving credit facility, Senior Secured Notes net of unamortized discount and deferred financing costs, and Senior Unsecured Notes, net of unamortized deferred financing costs, as of December 31, 2020, and 2019:
| As of December 31, 2020 |  | As of December 31, 2019
| (in thousands)
Revolving credit facility | $ | 93,000 |  |  | $ | 122,500 |
Senior Secured Notes (1) | 460,656 |  |  | — |
Senior Unsecured Notes (1) | 1,660,663 |  |  | 2,610,298 |
Total | $ | 2,214,319 |  |  | $ | 2,732,798 |
____________________________________________ (1) Senior Secured Notes and Senior Unsecured Notes are defined below. During the year ended December 31, 2020, the Company executed multiple transactions to reduce outstanding debt. During the second quarter of 2020, the Company initiated an offer to exchange certain of its outstanding senior unsecured notes, as presented in the Senior Unsecured Notes section below (“Senior Unsecured Notes”), other than the 1.50% Senior Convertible Notes due 2021 (“2021 Senior Convertible Notes,” and together with the Senior Unsecured Notes, “Old Notes”), and entered into a private exchange of certain of its outstanding 2021 Senior Convertible Notes and portions of its outstanding Senior Unsecured Notes (“Private Exchange”), in each case for newly issued 10.0% Senior Secured Second Lien Notes due January 15, 2025 (“2025 Senior Secured Notes”), referred to together as “Exchange Offers.” In connection with the Exchange Offers, the Company and its lenders amended the Credit Agreement to increase the amount of permitted second lien indebtedness to an aggregate amount of $1.0 billion, inclusive of the 2021 Senior Convertible Notes (“Permitted Second Lien Debt”). Additionally, the Company amended the indenture governing its 2021 Senior Convertible Notes, by entering into the Third Supplemental Indenture, dated as of April 29, 2020 (“Third Supplemental Indenture”), to the original Indenture, dated as of May 21, 2015, as supplemented and amended by the Second Supplemental Indenture, dated as of August 12, 2016, collectively referred to as the (“2021 Notes Indenture”). The Third Supplemental Indenture provides that the Company will satisfy any conversion obligation solely in cash. On June 17, 2020 (“Settlement Date”), the Company exchanged $611.9 million in aggregate principal amount of Senior Unsecured Notes and $107.0 million in aggregate principal amount of 2021 Senior Convertible Notes for $446.7 million in aggregate principal amount of 2025 Senior Secured Notes, as well as, in connection with the Private Exchange, (a) $53.5 million in cash to certain holders of the 2021 Senior Convertible Notes and (b) warrants to acquire up to an aggregate of approximately 5.9 million shares, or approximately five percent of its outstanding common stock, exercisable upon the occurrence of certain future triggering events, to certain holders who exchanged Old Notes in the Private Exchange. Please refer to Note 11 – Fair Value Measurements for more information regarding the warrants issued by the Company. Pursuant to the 2021 Notes Indenture, upon the issuance of Permitted Second Lien Debt, the remaining outstanding 2021 Senior Convertible Notes became secured and are subsequently referred to as the “2021 Senior Secured Convertible Notes,” and together with the 2025 Senior Secured Notes, the “Senior Secured Notes.” For a summary of the principal amounts of the Senior Unsecured Notes tendered as of the Settlement Date, please refer to the Senior Unsecured Notes section below. The Company retired $611.9 million and $107.0 million in aggregate principal amount of its Senior Unsecured Notes and 2021 Senior Convertible Notes, respectively, upon the closing of the Exchange Offers. Upon closing, the Company paid $8.9 million of accrued and unpaid interest and accelerated $5.6 million of previously unamortized deferred financing costs associated with the retired Senior Unsecured Notes and 2021 Senior Convertible Notes and accelerated $6.1 million of previously unamortized debt discount associated with the retired 2021 Senior Convertible Notes. The Exchange Offers resulted in a net gain on extinguishment of debt of $227.3 million. The Company cancelled all retired Senior Unsecured Notes and 2021 Senior Convertible Notes upon the closing of the Exchange Offers. Additionally, during 2020, in open market transactions, the Company repurchased a total of $190.3 million in aggregate principal amount of its 2022 Senior Notes and 2024 Senior Notes for a total settlement amount, excluding accrued interest, of $136.5 million. In connection with the repurchases, the Company recorded a net gain on extinguishment of debt of $52.8 million for the year ended December 31, 2020. This amount included discounts realized upon repurchase of $53.8 million partially offset by approximately $1.0 million of accelerated unamortized deferred financing costs. The Company canceled all repurchased 2022 Senior Notes and 2024 Senior Notes upon settlement. Please refer to the Credit Agreement and Senior Notes sections below for additional information. Credit Agreement The Company’s Credit Agreement provides for a senior secured revolving credit facility with a maximum loan amount of $2.5 billion. During the second quarter of 2020, as a result of lower commodity prices and a corresponding decrease in the value of the Company’s proved reserves, the borrowing base and aggregate lender commitments under the Credit Agreement were both reduced to $1.1 billion. Also during the second quarter of 2020, the Company entered into the Third Amendment and the Fourth Amendment to the Credit Agreement (collectively, the “Amendments”), which permitted the Company to incur new second lien debt of up to $827.5 million prior to October 1, 2020, provided that all principal amounts of such debt are used to redeem unsecured senior debt of the Company for less than or equal to 80% of par value. The Amendments also permitted the Company to grant a second-priority security interest to the holders of the Company’s outstanding 2021 Senior Convertible Notes to secure the Company’s obligations under the 2021 Senior Convertible Notes. Additionally, the Amendments reduced the amount of dividends that the Company may declare and pay on an annual basis from $50.0 million to $12.0 million. During the fourth quarter of 2020, the Company and its lenders completed the fall semi-annual borrowing base redetermination and entered into the Fifth Amendment to the Credit Agreement, which reaffirmed the Company’s borrowing base and aggregate lender commitments at existing levels and extended the Company’s ability to incur Permitted Second Lien Debt until the next scheduled borrowing base redetermination date of April 1, 2021. As of December 31, 2020, the Company had $380.8 million of available Permitted Second Lien Debt capacity. The Credit Agreement is scheduled to mature on September 28, 2023, except that, pursuant to the Amendments, newly issued Permitted Second Lien Debt used to redeem any portion of the remaining 2022 Senior Notes must have maturities on or after 180 days after September 28, 2023; otherwise, the maturity date of the Credit Agreement will be July 2, 2023. Without regard to which maturity date is in effect, the maturity date could occur earlier on August 16, 2022, if the Company has not completed certain repurchase, redemption, or refinancing activities associated with its 2022 Senior Notes, and does not have certain unused availability for borrowing under the Credit Agreement, as outlined in the Credit Agreement. Interest and commitment fees associated with the revolving credit facility are accrued based on a borrowing base utilization grid set forth in the Credit Agreement. The Third Amendment to the Credit Agreement amended the borrowing base utilization grid as presented in the table below. At the Company’s election, borrowings under the Credit Agreement may be in the form of Eurodollar, Alternate Base Rate (“ABR”), or Swingline loans. Eurodollar loans accrue interest at LIBOR, plus the applicable margin from the utilization grid, and ABR and Swingline loans accrue interest at a market-based floating rate, plus the applicable margin from the utilization grid. Commitment fees are accrued on the unused portion of the aggregate lender commitment amount at rates from the utilization grid and are included in the interest expense line item on the accompanying statements of operations.
Borrowing Base Utilization Percentage |  | <25% |  | ≥25% <50% |  | ≥50% <75% |  | ≥75% <90% |  | ≥90%
Eurodollar Loans (1) |  | 1.750 | % |  | 2.000 | % |  | 2.500 | % |  | 2.750 | % |  | 3.000 | %
ABR Loans or Swingline Loans |  | 0.750 | % |  | 1.000 | % |  | 1.500 | % |  | 1.750 | % |  | 2.000 | %
Commitment Fee Rate |  | 0.375 | % |  | 0.375 | % |  | 0.500 | % |  | 0.500 | % |  | 0.500 | %
____________________________________________ (1) The Credit Agreement specifies that if LIBOR is no longer a widely used benchmark rate, or if it is no longer used for determining interest rates for loans in the United States, a replacement interest rate that fairly reflects the cost to the lenders of funding loans shall be established by the Administrative Agent, as defined in the Credit Agreement, in consultation with the Company. Please refer to Note 1 – Summary of Significant Accounting Policies for discussion of FASB ASU 2020-04, which provides guidance related to reference rate reform. The following table presents the outstanding balance, total amount of letters of credit outstanding, and available borrowing capacity under the Credit Agreement as of February 4, 2021, December 31, 2020, and December 31, 2019:
| As of February 4, 2021 |  | As of December 31, 2020 |  | As of December 31, 2019
| (in thousands)
Revolving credit facility (1) | $ | 121,500 |  |  | $ | 93,000 |  |  | $ | 122,500 |
Letters of credit (2) | 42,000 |  |  | 42,000 |  |  | — |
Available borrowing capacity | 936,500 |  |  | 965,000 |  |  | 1,077,500 |
Total aggregate lender commitment amount | $ | 1,100,000 |  |  | $ | 1,100,000 |  |  | $ | 1,200,000 |
____________________________________________ (1) Unamortized deferred financing costs attributable to the revolving credit facility are presented as a component of the other noncurrent assets line item on the accompanying balance sheets and totaled $4.3 million and $5.9 million as of December 31, 2020, and 2019, respectively. These costs are being amortized over the term of the revolving credit facility on a straight-line basis. (2) Letters of credit outstanding reduce the amount available under the revolving credit facility on a dollar-for-dollar basis. Senior Notes Senior Secured Notes. Senior Secured Notes, net of unamortized debt discount and deferred financing costs, included within the Senior Notes, net line item on the accompanying balance sheets as of December 31, 2020, consisted of the following:
| As of December 31, 2020
| Principal Amount |  | Unamortized Debt Discount |  | Unamortized Deferred Financing Costs |  | Net
| (in thousands)
10.0% Senior Secured Notes due 2025 | $ | 446,675 |  |  | $ | 37,943 |  |  | $ | 11,558 |  |  | $ | 397,174 |
1.50% Senior Secured Convertible Notes due 2021 (1) | 65,485 |  |  | 1,828 |  |  | 175 |  |  | 63,482 |
Total | $ | 512,160 |  |  | $ | 39,771 |  |  | $ | 11,733 |  |  | $ | 460,656 |
____________________________________________ (1) As discussed above, as required by the 2021 Notes Indenture and as permitted by the Credit Agreement, as the Company issued Permitted Second Lien Debt upon the closing of the Exchange Offers, its remaining 2021 Senior Convertible Notes contemporaneously became secured. 2025 Senior Secured Notes. On June 17, 2020, the Company issued $446.7 million in aggregate principal amount of 2025 Senior Secured Notes due January 15, 2025. The Company incurred fees of $13.1 million, which are being amortized as deferred financing costs over the life of the 2025 Senior Secured Notes. Upon the issuance of the 2025 Senior Secured Notes, the Company recorded $405.0 million as the initial carrying amount, which approximated their fair value at issuance. The excess of the principal amount of the 2025 Senior Secured Notes over its fair value was recorded as a debt discount. The debt discount and deferred financing costs are amortized to interest expense through the maturity date. In connection with the issuance of the 2025 Senior Secured Notes, the Company entered into an indenture dated as of June 17, 2020 with UMB Bank, N.A., as trustee, governing the 2025 Senior Secured Notes (“2025 Notes Indenture”). The Company may redeem some or all of its 2025 Senior Secured Notes prior to their maturity at redemption prices based on a premium, plus accrued and unpaid interest as described in the 2025 Notes Indenture. The 2025 Senior Secured Notes are senior obligations of the Company, secured on a second-priority basis, ranking junior to the Company’s obligations under the Credit Agreement and equal in priority with the 2021 Senior Secured Convertible Notes. The 2025 Senior Secured Notes rank senior in right of payment with all of the Company’s existing and any future unsecured senior or subordinated debt. 2021 Senior Secured Convertible Notes. On August 12, 2016, the Company issued $172.5 million in aggregate principal amount of 1.50% Senior Convertible Notes due July 1, 2021, unless earlier converted. The Company received net proceeds of $166.6 million after deducting fees of $5.9 million, of which a portion is being amortized over the life of the 2021 Senior Convertible Notes. Upon the issuance of the 2021 Senior Convertible Notes, the Company recorded $132.3 million as the initial carrying amount of the debt component, which approximated its fair value at issuance, and, was estimated by using an interest rate for nonconvertible debt with terms similar to the Senior Convertible Notes. The effective interest rate used was 7.25%. The $40.2 million excess of the principal amount of the 2021 Senior Convertible Notes over the fair value of the debt component was recorded as a debt discount and a corresponding increase in additional paid-in capital. The Company incurred fees of $5.9 million relating to the issuance of the 2021 Senior Convertible Notes, which were allocated between the debt and equity components in proportion to their determined fair value amounts. During the second quarter of 2020, pursuant to the Third Supplemental Indenture, the Company agreed to satisfy any conversion obligation solely in cash, resulting in reclassification of the fair value of the equity components out of additional paid-in capital. As of December 31, 2019, the net carrying amount of the equity component of the Senior Convertible Notes recorded in additional paid-in capital on the accompanying balance sheets was $33.6 million. The debt discount and debt-related issuance costs are being amortized to the principal value of the 2021 Senior Secured Convertible Notes as interest expense through the maturity date. Interest expense recognized on the 2021 Senior Secured Convertible Notes related to the stated interest rate and amortization of the debt discount totaled $7.7 million, $11.0 million, and $10.5 million for the years ended December 31, 2020, 2019, and 2018, respectively. Upon the closing of the Exchange Offers, the Company retired $107.0 million in aggregate principal amount of its 2021 Senior Convertible Notes. Upon issuance of the 2025 Senior Secured Notes, which was Permitted Second Lien Debt, as required by the 2021 Notes Indenture, and as permitted by the Credit Agreement, the remaining 2021 Senior Convertible Notes became secured senior obligations of the Company on a second-priority basis, ranking junior to the Company’s obligations under the Credit Agreement and equal in priority with the 2025 Senior Secured Notes. The 2021 Senior Secured Convertible Notes rank senior in right of payment to all of the Company’s existing and any future unsecured senior or subordinated debt. Prior to January 1, 2021, holders could convert their 2021 Senior Convertible Notes at their option only under certain circumstances as defined by the 2021 Notes Indenture. The 2021 Senior Secured Convertible Notes were not convertible at the option of holders as of December 31, 2020. Notwithstanding the inability to convert as of December 31, 2020, the if-converted value of the 2021 Senior Secured Convertible Notes did not exceed the principal amount as of December 31, 2020, or through the filing of this report. On or after January 1, 2021, until the maturity date, holders may convert their 2021 Senior Secured Convertible Notes at any time. Holders may convert their notes based on a conversion rate of 24.6914 shares of the Company’s common stock per $1,000 principal amount of the 2021 Senior Secured Convertible Notes, which is equal to an initial conversion price of approximately $40.50 per share, subject to adjustment. The Company may not redeem the 2021 Senior Convertible Notes prior to the maturity date. The Company has the ability, and currently intends to settle its 2021 Senior Secured Convertible Notes obligation, due July 1, 2021, with borrowings under its revolving credit facility. If the Company undergoes a fundamental change, as defined by the 2021 Notes Indenture, holders of the 2021 Senior Secured Convertible Notes may require the Company to repurchase for cash all or any portion of their notes at a fundamental change repurchase price equal to 100% of the principal amount of the 2021 Senior Secured Convertible Notes to be repurchased, plus accrued and unpaid interest. The 2021 Notes Indenture contains customary events of default with respect to the 2021 Senior Secured Convertible Notes, including that upon certain events of default, the trustee by notice to the Company, or the holders of at least 25% in principal amount of the outstanding 2021 Senior Secured Convertible Notes by notice to the Company, may declare 100% of the principal and accrued and unpaid interest, if any, due and payable immediately. In case of certain events of bankruptcy, insolvency or reorganization involving the Company or a significant subsidiary, 100% of the principal and accrued and unpaid interest on the Senior Convertible Notes will automatically become due and payable. In connection with the issuance of the 2021 Senior Convertible Notes, the Company entered into capped call transactions with affiliates of the underwriters of such issuance. The aggregate cost of the capped call transactions was approximately $24.2 million. The capped call transactions are generally expected to partially offset any cash payments the Company is required to make in excess of the principal amount of converted 2021 Senior Secured Convertible Notes in the event that the market price per share of the Company’s common stock is greater than the strike price of the capped call transactions, which initially corresponds to the approximate $40.50 per share conversion price of the 2021 Senior Secured Convertible Notes. The cap price of the capped call transactions is initially $60.00 per share. If the market price per share exceeds the cap price of the capped call transactions, there would not be an offset of such potential cash payments. The Company classified the costs associated with the capped call transactions as equity instruments with no recurring fair value measurement recorded. As discussed above, during the second quarter of 2020, the fair value of this equity instrument was reclassified out of additional paid-in capital upon the Company’s agreement to satisfy any conversion obligation solely in cash. Senior Unsecured Notes Senior Unsecured Notes, net of unamortized deferred financing costs, included within the Senior Notes, net line item on the accompanying balance sheets as of December 31, 2020, and 2019, consisted of the following:
| As of December 31, 2020 |  | As of December 31, 2019
| Principal Amount |  | Unamortized Deferred Financing Costs |  | Principal Amount, Net |  | Principal Amount |  | Unamortized Deferred Financing Costs |  | Principal Amount, Net
| (in thousands)
6.125% Senior Notes due 2022 | $ | 212,403 |  |  | $ | 855 |  |  | $ | 211,548 |  |  | $ | 476,796 |  |  | $ | 2,920 |  |  | $ | 473,876 |
5.0% Senior Notes due 2024 | 277,034 |  |  | 1,576 |  |  | 275,458 |  |  | 500,000 |  |  | 3,766 |  |  | 496,234 |
5.625% Senior Notes due 2025 | 349,118 |  |  | 2,792 |  |  | 346,326 |  |  | 500,000 |  |  | 4,903 |  |  | 495,097 |
6.75% Senior Notes due 2026 | 419,235 |  |  | 3,970 |  |  | 415,265 |  |  | 500,000 |  |  | 5,571 |  |  | 494,429 |
6.625% Senior Notes due 2027 | 416,791 |  |  | 4,725 |  |  | 412,066 |  |  | 500,000 |  |  | 6,601 |  |  | 493,399 |
1.50% Senior Convertible Notes due 2021 (1)(2) | — |  |  | — |  |  | — |  |  | 172,500 |  |  | 15,237 |  |  | 157,263 |
Total | $ | 1,674,581 |  |  | $ | 13,918 |  |  | $ | 1,660,663 |  |  | $ | 2,649,296 |  |  | $ | 38,998 |  |  | $ | 2,610,298 |
____________________________________________ (1) Unamortized deferred financing costs attributable to the 2021 Senior Convertible Notes include $13.9 million related to the unamortized debt discount as of December 31, 2019. (2) As discussed above, as required by the 2021 Notes Indenture and as permitted by the Credit Agreement, as the Company issued Permitted Second Lien Debt upon the closing of the Exchange Offers, its remaining 2021 Senior Convertible Notes contemporaneously became secured. The senior unsecured notes listed above (collectively referred to as “Senior Unsecured Notes,” and together with the Senior Secured Notes, “Senior Notes”) are unsecured senior obligations and rank equal in right of payment with all of the Company’s existing and any future unsecured senior debt and are senior in right of payment to any future subordinated debt. The Company may redeem some or all of its Senior Unsecured Notes prior to their maturity at redemption prices based on a premium, plus accrued and unpaid interest as described in the indentures governing the Senior Unsecured Notes. Upon the closing of the Exchange Offers, the Company retired $611.9 million in aggregate principal amount of its Senior Unsecured Notes. Portions of the then-outstanding principal amount of each series of our Senior Unsecured Notes listed below were tendered and retired in connection with the Exchange Offers. The following table summarizes the principal amounts of the Senior Unsecured Notes tendered as of the Settlement Date:
Title of Senior Unsecured Notes Tendered |  | Principal Amount of Senior Unsecured Notes Tendered
|  | (in thousands)
6.125% Senior Notes due 2022 |  | $ | 141,701 |
5.0% Senior Notes due 2024 |  | 155,339 |
5.625% Senior Notes due 2025 |  | 150,882 |
6.75% Senior Notes due 2026 |  | 80,765 |
6.625% Senior Notes due 2027 |  | 83,209 |
Total |  | $ | 611,896 |
2022 Senior Notes. On November 17, 2014, the Company issued $600.0 million in aggregate principal amount of 6.125% Senior Notes due 2022 at par, which mature on November 15, 2022. The Company received net proceeds of $590.0 million after deducting fees of $10.0 million, which are being amortized as deferred financing costs over the life of the 2022 Senior Notes. During 2016, the Company repurchased $38.2 million in aggregate principal amount of its 2022 Senior Notes for a settlement amount of $24.3 million, excluding accrued interest. During 2018, the Company retired $85.0 million of its 2022 Senior Notes for a total settlement amount of $88.1 million, excluding accrued interest. During 2020, the Company repurchased $122.7 million in aggregate principal amount of its 2022 Senior Notes for a settlement amount of $94.2 million, excluding accrued interest. 2024 Senior Notes. On May 20, 2013, the Company issued $500.0 million in aggregate principal amount of 5.0% Senior Notes due 2024 at par, which mature on January 15, 2024. The Company received net proceeds of $490.2 million after deducting fees of $9.8 million, which are being amortized as deferred financing costs over the life of the 2024 Senior Notes. During 2020, the Company repurchased $67.6 million in aggregate principal amount of its 2024 Senior Notes for a total settlement amount of $42.3 million, excluding accrued interest. 2025 Senior Notes. On May 21, 2015, the Company issued $500.0 million in aggregate principal amount of 5.625% Senior Notes due 2025 at par, which mature on June 1, 2025. The Company received net proceeds of $491.0 million after deducting fees of $9.0 million, which are being amortized as deferred financing costs over the life of the 2025 Senior Notes. 2026 Senior Notes. On September 12, 2016, the Company issued $500.0 million in aggregate principal amount of 6.75% Senior Notes due 2026, at par, which mature on September 15, 2026. The Company received net proceeds of $491.6 million after deducting fees of $8.4 million, which are being amortized as deferred financing costs over the life of the 2026 Senior Notes. 2027 Senior Notes. On August 20, 2018, the Company issued $500.0 million in aggregate principal amount of 6.625% Senior Notes due 2027, at par, which mature on January 15, 2027. The Company received net proceeds of $492.1 million after deducting fees of $7.9 million, which are being amortized as deferred financing costs over the life of the 2027 Senior Notes. Covenants The Company is subject to certain financial and non-financial covenants under the Credit Agreement and the indentures governing the Senior Notes that, among other terms, limit the Company’s ability to incur additional indebtedness, make restricted payments including dividends, sell assets, with respect to the Company’s restricted subsidiaries, permit the consensual restriction on the ability of such restricted subsidiaries to pay dividends or indebtedness owing to the Company or to any other restricted subsidiaries, create liens that secure debt, enter into transactions with affiliates, and merge or consolidate with another company. The financial covenants under the Credit Agreement require that the Company’s (a) total funded debt, as defined in the Credit Agreement, to 12-month trailing adjusted EBITDAX ratio cannot be greater than 4.00 to 1.00 on the last day of each fiscal quarter; and (b) adjusted current ratio, as defined in the Credit Agreement, cannot be less than 1.00 to 1.00 as of the last day of any fiscal quarter. The Company was in compliance with all covenants under the Credit Agreement and the indentures governing the Senior Notes as of December 31, 2020, and through the filing of this report. Capitalized Interest Capitalized interest costs for the years ended December 31, 2020, 2019, and 2018, totaled $15.8 million, $18.5 million, and $20.6 million, respectively. The amount of interest the Company capitalizes generally fluctuates based on the amount borrowed, the Company’s capital program, and the timing and amount of costs associated with capital projects that are considered in progress. Capitalized interest costs are included in total costs incurred. Please refer to Costs Incurred in Overview of the Company in Part II, Item 7, and Supplemental Oil and Gas Information (unaudited) in Part II, Item 8 of this report.

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