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Long-Term Debt | 6 Months Ended
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Jun. 30, 2017
Debt Disclosure [Abstract] |
Long-term Debt [Text Block] | Note 5 - Long-Term Debt Credit Facility The Company’s Fifth Amended and Restated Credit Agreement, as amended (the “Credit Agreement”), provides for a maximum loan amount of $2.5 billion and has a maturity date of December 10, 2019. On March 31, 2017, the Company entered into a Ninth Amendment to the Credit Agreement (the “Ninth Amendment”) with its lenders. Pursuant to the Ninth Amendment, and as part of the regular, semi-annual borrowing base redetermination process, the borrowing base and aggregate lender commitments were reduced to $925 million. This expected reduction was primarily due to the sale of the Company’s outside-operated Eagle Ford shale assets in the first quarter of 2017 and the decrease in the value of the Company’s proved reserves at December 31, 2016. The borrowing base redetermination process considers the value of both the Company’s (a) proved oil and gas properties reflected in the Company’s most recent reserve report and (b) commodity derivative contracts, each as determined by the Company’s lender group. Additionally, the Ninth Amendment modified the Credit Agreement to allow the Company to enter into derivative contracts for an increased percentage of projected production volumes. As a result of the reduction to the Company’s borrowing base and aggregate lender commitments, the Company recorded approximately $1.1 million of expense related to the acceleration of unamortized deferred financing costs for the six months ended June 30, 2017. The next scheduled redetermination date is October 1, 2017. The Company must comply with certain financial and non-financial covenants under the terms of the Credit Agreement, including covenants limiting dividend payments and requiring the Company to maintain certain financial ratios, as defined by the Credit Agreement. Certain financial covenants under the Credit Agreement require, as of the last day of each of the Company’s fiscal quarters, the Company’s (a) ratio of senior secured debt to 12-month trailing adjusted EBITDAX to be not more than 2.75 to 1.0; (b) adjusted current ratio to be not less than 1.0 to 1.0; and (c) ratio of 12-month trailing adjusted EBITDAX to interest expense to be not less than 2.0 to 1.0. The Company was in compliance with all financial and non-financial covenants under the Credit Agreement as of June 30, 2017, and through the filing of this report. Interest and commitment fees are accrued based on a borrowing base utilization grid set forth in the Credit Agreement and presented in Note 5 - Long-Term Debt to the Company’s consolidated financial statements in its 2016 Form 10-K. Eurodollar loans accrue interest at the London Interbank Offered Rate plus the applicable margin from the utilization table, and Alternate Base Rate and swingline loans accrue interest at the prime rate, plus the applicable margin from the utilization table. Commitment fees are accrued on the unused portion of the aggregate lender commitment amount and are included in interest expense in the accompanying statements of operations. The following table presents the outstanding balance, total amount of letters of credit outstanding, and available borrowing capacity under the Credit Agreement as of July 26, 2017, June 30, 2017, and December 31, 2016:
| As of July 26, 2017 |  | As of June 30, 2017 |  | As of December 31, 2016
| (in thousands)
Credit facility balance (1) | $ | — |  |  | $ | — |  |  | $ | — |
Letters of credit (2) | 200 |  |  | 200 |  |  | 200 |
Available borrowing capacity | 924,800 |  |  | 924,800 |  |  | 1,164,800 |
Total aggregate lender commitment amount | $ | 925,000 |  |  | $ | 925,000 |  |  | $ | 1,165,000 |
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(1) | Unamortized deferred financing costs attributable to the credit facility are presented as a component of other noncurrent assets on the accompanying balance sheets and totaled $3.9 million and $5.9 million as of June 30, 2017, and December 31, 2016, respectively.
(2) | Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis.
Senior Notes The Company’s Senior Notes consist of 6.50% Senior Notes due 2021, 6.125% Senior Notes due 2022, 6.50% Senior Notes due 2023, 5.0% Senior Notes due 2024, 5.625% Senior Notes due 2025, and 6.75% Senior Notes due 2026 (collectively referred to as “Senior Notes”). The Senior Notes, net of unamortized deferred financing costs line on the accompanying balance sheets as of June 30, 2017, and December 31, 2016, consisted of the following:
| As of June 30, 2017 |  | As of December 31, 2016
| Principal Amount |  | Unamortized Deferred Financing Costs |  | Senior Notes, Net of Unamortized Deferred Financing Costs |  | Principal Amount |  | Unamortized Deferred Financing Costs |  | Senior Notes, Net of Unamortized Deferred Financing Costs
| (in thousands)
6.50% Senior Notes due 2021 (1) (2) | $ | 344,611 |  |  | $ | 3,003 |  |  | $ | 341,608 |  |  | $ | 346,955 |  |  | $ | 3,372 |  |  | $ | 343,583 |
6.125% Senior Notes due 2022 (2) | 561,796 |  |  | 6,390 |  |  | 555,406 |  |  | 561,796 |  |  | 6,979 |  |  | 554,817 |
6.50% Senior Notes due 2023 (2) | 394,985 |  |  | 4,071 |  |  | 390,914 |  |  | 394,985 |  |  | 4,436 |  |  | 390,549 |
5.0% Senior Notes due 2024 | 500,000 |  |  | 6,072 |  |  | 493,928 |  |  | 500,000 |  |  | 6,533 |  |  | 493,467 |
5.625% Senior Notes due 2025 | 500,000 |  |  | 7,166 |  |  | 492,834 |  |  | 500,000 |  |  | 7,619 |  |  | 492,381 |
6.75% Senior Notes due 2026 | 500,000 |  |  | 7,660 |  |  | 492,340 |  |  | 500,000 |  |  | 8,078 |  |  | 491,922 |
Total | $ | 2,801,392 |  |  | $ | 34,362 |  |  | $ | 2,767,030 |  |  | $ | 2,803,736 |  |  | $ | 37,017 |  |  | $ | 2,766,719 |
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(1) | During the first quarter of 2017, the Company repurchased a total of $2.3 million in aggregate principal amount of 6.50% Senior Notes due 2021 in open market transactions at a slight premium. The Company canceled all of these repurchased Senior Notes upon cash settlement.
(2) | During the first quarter of 2016, the Company repurchased a total of $46.3 million in aggregate principal amount of certain of its Senior Notes in open market transactions for a settlement amount of $29.9 million, excluding interest. The Company recorded a net gain on extinguishment of debt of approximately $15.7 million for the six months ended June 30, 2016. This amount includes a gain of approximately $16.4 million associated with the discount realized upon repurchase, which was partially offset by approximately $0.7 million related to the acceleration of unamortized deferred financing costs. The Company canceled all of these repurchased Senior Notes upon cash settlement.
The 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. There are no subsidiary guarantors of the Senior Notes. The Company is subject to certain covenants under the indentures governing the Senior Notes and was in compliance with all covenants as of June 30, 2017, and through the filing of this report. The Company may redeem some or all of its Senior 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 Notes. Senior 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 (the “Senior Convertible Notes”). The Senior Convertible 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 Senior Convertible Notes mature on July 1, 2021, unless earlier converted. Holders may convert their Senior Convertible Notes at their option at any time prior to January 1, 2021, only under certain circumstances as outlined in the indenture governing the Senior Convertible Notes and in Note 5 – Long-Term Debt to the Company’s consolidated financial statements in its 2016 Form 10-K. On or after January 1, 2021, until the maturity date, holders may convert their Senior Convertible Notes at any time. The Company may not redeem the Senior Convertible Notes prior to the maturity date. Upon conversion, the Senior Convertible Notes may be settled, at the Company’s election, in shares of the Company’s common stock, cash, or a combination of cash and common stock. 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 Senior Convertible Notes, which is equal to an initial conversion price of approximately $40.50 per share, subject to adjustment. The Company has initially elected a net-settlement method to satisfy its conversion obligation, which would result in the Company settling the principal amount in cash with any excess value in shares of the Company’s common stock. The Senior Convertible Notes were not convertible at the option of holders as of June 30, 2017, or through the filing of this report. Notwithstanding the inability to convert, the if-converted value of the Senior Convertible Notes as of June 30, 2017, did not exceed the principal amount. Upon the issuance of the 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 percent. The $40.2 million excess of the principal amount of the 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 debt discount and debt-related issuance costs are amortized to the principal value of the Senior Convertible Notes as interest expense through the maturity date of July 1, 2021. Interest expense recognized on the Senior Convertible Notes related to the stated interest rate and amortization of the debt discount totaled $2.5 million and $4.9 million for the three and six months ended June 30, 2017, respectively. The net carrying amount of the liability component of the Senior Convertible Notes, as reflected on the accompanying balance sheets as of June 30, 2017, and December 31, 2016, consisted of the following:
| As of June 30, 2017 |  | As of December 31, 2016
| (in thousands)
Principal amount of Senior Convertible Notes | $ | 172,500 |  |  | $ | 172,500 |
Unamortized debt discount | (33,913 | ) |  | (37,513 | )
Unamortized deferred financing costs | (3,669 | ) |  | (4,131 | )
Net carrying amount | $ | 134,918 |  |  | $ | 130,856 |
The Company is subject to certain covenants under the indenture governing the Senior Convertible Notes and was in compliance with all covenants as of June 30, 2017, and through the filing of this report. Capped Call Transactions In connection with the issuance of the Senior Convertible Notes, the Company entered into capped call transactions with affiliates of the underwriters of such issuance. The capped call transactions are generally expected to reduce the potential dilution upon conversion of the Senior Convertible Notes and/or partially offset any cash payments the Company is required to make in excess of the principal amount of converted Senior 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 Senior 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 could be dilution or there would not be an offset of such potential cash payments.

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