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Debt and Credit Agreements | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Debt and Credit Agreements | Debt and Credit Agreements The Company's debt and credit agreements consisted of the following:
| December 31,
(In thousands) | 2020 |  | 2019
Total debt |  |  |
6.51% weighted-average senior notes (1) | $ | 37,000 |  |  | $ | 124,000 |
5.58% weighted-average senior notes (2) | 175,000 |  |  | 175,000 |
3.65% weighted-average senior notes (3) | 925,000 |  |  | 925,000 |
Revolving credit facility | — |  |  | — |
Unamortized debt issuance costs | (3,076) |  |  | (3,975) |
| $ | 1,133,924 |  |  | $ | 1,220,025 |
_______________________________________________________________________________ (1)Includes $87.0 million of current portion of long-term debt at December 31, 2019, which the Company repaid in July 2020. (2)Includes $88.0 million of current portion of long-term debt at December 31, 2020, which the Company repaid in January 2021. (3)Includes $100.0 million of current portion of long-term debt at December 31, 2020 due in September 2021. The Company has debt maturities of $188.0 million due in 2021, $62.0 million due in 2023 and $575.0 million due in 2024 associated with its senior notes. In addition, the revolving credit facility matures in April 2024. No other tranches of debt are due within the next five years. At December 31, 2020, the Company was in compliance with all restrictive financial covenants for both its revolving credit facility and senior notes. Senior Notes The Company has various issuances of senior notes. Interest on each of the senior notes is payable semi-annually. Under the terms of the various senior note agreements, the Company may prepay all or any portion of the notes of each series on any date at a price equal to the principal amount thereof plus accrued and unpaid interest plus a make-whole premium. The Company's agreements provide that the Company maintain a minimum asset coverage ratio of 1.75 to 1.0 and a minimum annual coverage ratio of consolidated cash flow to interest expense for the trailing four quarters of 2.8 to 1.0. There are also various other covenants and events of default customarily found in such debt instruments. 6.51% Weighted-Average Senior Notes In July 2008, the Company issued $425.0 million of senior unsecured notes to a group of 41 institutional investors in a private placement. The notes have bullet maturities and were issued in three separate tranches as follows:
| Principal |  | Term |  | Maturity Date |  | Coupon
Tranche 1 | $ | 245,000,000 |  |  | 10 years |  | July 2018 |  | 6.44 | %
Tranche 2 | $ | 100,000,000 |  |  | 12 years |  | July 2020 |  | 6.54 | %
Tranche 3 | $ | 80,000,000 |  |  | 15 years |  | July 2023 |  | 6.69 | %
In May 2016, the Company repurchased $8.0 million of Tranche 1, $13.0 million of Tranche 2 and $43.0 million of Tranche 3 for a total of $64.0 million for $68.3 million. As of December 31, 2020, the Company has repaid $388.0 million of aggregate principal amount associated with the 6.51% weighted-average senior notes. 5.58% Weighted-Average Senior Notes In December 2010, the Company issued $175.0 million of senior unsecured notes to a group of eight institutional investors in a private placement. The notes have bullet maturities and were issued in three separate tranches as follows:
| Principal |  | Term |  | Maturity Date |  | Coupon
Tranche 1 | $ | 88,000,000 |  |  | 10 years |  | January 2021 |  | 5.42 | %
Tranche 2 | $ | 25,000,000 |  |  | 12 years |  | January 2023 |  | 5.59 | %
Tranche 3 | $ | 62,000,000 |  |  | 15 years |  | January 2026 |  | 5.80 | %
Subsequent Event. In January 2021, the Company repaid $88.0 million of maturities associated with its 5.58% weighted-average senior notes. 3.65% Weighted‑Average Senior Notes In September 2014, the Company issued $925.0 million of senior unsecured notes to a group of 24 institutional investors in a private placement. The notes have bullet maturities and were issued in three separate tranches as follows:
| Principal |  | Term |  | Maturity Date |  | Coupon
Tranche 1 | $ | 100,000,000 |  |  | 7 years |  | September 2021 |  | 3.24 | %
Tranche 2 | $ | 575,000,000 |  |  | 10 years |  | September 2024 |  | 3.67 | %
Tranche 3 | $ | 250,000,000 |  |  | 12 years |  | September 2026 |  | 3.77 | %
Revolving Credit Agreement On April 22, 2019, the Company entered into a second amended and restated credit agreement (the revolving credit facility). The Company's revolving credit facility is unsecured and the borrowing base is redetermined annually on April 1. In addition, either the Company or the banks may request an interim redetermination twice a year or in connection with certain acquisitions or divestitures of oil and gas properties. The Company’s borrowing base and available commitments under the revolving credit facility were $3.2 billion and $1.5 billion, respectively. The maximum revolving credit available to the Company is the lesser of the available commitments or the difference of the borrowing base less outstanding senior notes. The Company's revolving credit facility matures in April 2024 and can be extended by one year upon the agreement of the Company and lenders holding at least 50 percent of the commitments under the revolving credit facility. Interest rates under the revolving credit facility are based on LIBOR or ABR indications, plus a margin which ranges from 150 to 225 basis points for LIBOR loans and from 50 to 125 basis points for ABR loans when not in an Investment Grade Period (as defined in the amended and restated credit agreement) and from 112.5 to 175 basis points for LIBOR loans and from 12.5 to 75 basis points for ABR loans during an Investment Grade Period. The revolving credit facility also provides for a commitment fee on the unused available balance and is calculated at annual rates ranging from 30 to 42.5 basis points when not in an Investment Grade Period and from 12.5 to 27.5 basis points during an Investment Grade Period. The Company is currently not in an Investment Grade Period. From time to time, the Company uses the LIBOR benchmark rate for borrowings under its revolving credit facility. In July 2017, the U.K. Financial Conduct Authority (FCA) announced that it will no longer compel banks to submit rates that are currently used to calculate LIBOR after 2021. In November 2020, the FCA and ICE Benchmark Administration, which administers LIBOR quotations, announced the intention to consult on the extension of most LIBOR tenors to June 30, 2023 for legacy contracts only. The Company’s revolving credit facility has a term that extends beyond June 30, 2023. The Company’s revolving credit facility also provides that in the event that the LIBOR benchmark rate is no longer available, the Company and its lenders will endeavor to establish an alternative interest rate based on the then prevailing market convention for purposes of LIBOR borrowings. The Company currently has no borrowings outstanding under its revolving credit facility and does not expect the transition to an alternative rate to have a material impact on its results of operations or cash flows. The revolving credit facility contains various customary covenants, which include the following (with all calculations based on definitions contained in the amended and restated credit agreement): (a)Maintenance of a minimum asset coverage ratio of 1.75 to 1.0. (b)Maintenance of a minimum annual coverage ratio of consolidated cash flow to interest expense for the trailing four quarters of 2.8 to 1.0; and (c)Maintenance of a minimum current ratio of 1.0 to 1.0. At December 31, 2020, there were no borrowings outstanding under the Company's revolving credit facility and unused commitments were $1.5 billion. The Company's weighted-average effective interest rate for the revolving credit facility during the year ended December 31, 2020 and 2019 was approximately 4.0 percent and 6.3 percent, respectively. During 2019, the Company incurred $7.4 million of debt issuance costs in connection with the amended and restated credit agreement, which were capitalized and will be amortized over the term of the amended and restated agreement. The remaining unamortized costs of $3.4 million will also be amortized over the term of the amended and restated agreement in accordance with ASC 470-50, Debt Modifications and Extinguishments.

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