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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions | The following table presents relevant information for the interest rate swap agreements outstanding during 2020:
| Tranche A | Tranche B | Tranche C 1 | Tranche D 1 | Tranche E | Tranche F 2
Notional amount at inception (in thousands) | $150,000 | $100,000 | $200,000 | $300,000 | $200,000 | $485,000
Maturity date | 3/13/2023 | 3/12/2023 | 3/12/2023 | 12/30/2022 | 12/30/2023 | 12/31/2021
Fixed interest rate | 1.954% | 1.956% | 2.413% | 2.204% | 1.862% | 0.743%
1 Not amended or extended. 2 Result of the merging of tranches F and G, which were disclosed within the Company’s Annual Report on Form 10-K for the year ended December 31, 2019.
Location and Amounts of Derivative Gains and Losses | The following table presents information on the location and amounts of interest rate swap gains and losses:
(In thousands) |  |  |  | Year ended December 31,
Derivatives Not Designated as Hedging Instruments | Location of Gain (Loss) Recognized in Consolidated Statements of Income |  | 2020 |  | 2019 |  | 2018
Interest rate swap agreements – unrealized portion |  | Net unrealized (loss) gain on financial instruments |  | $ | (27,569) |  |  | $ | (35,363) |  |  | $ | 3,772 |
Interest rate swap agreements – realized portion |  | Financing interest expense |  | $ | 15,842 |  |  | $ | (5,411) |  |  | $ | (6,160) |

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