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Debt and Credit Agreement (Tables) | 6 Months Ended
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Jun. 30, 2021
Debt Disclosure [Abstract] |
Changes in Balance of Deferred Debt Issuance Costs | The following table represents changes in the balance of the Company's deferred debt issuance costs:
| (In thousands)
Balance as of December 31, 2020 | $ | 4,253 |
Additions | — |
Amortization | (549) |
Balance as of June 30, 2021 | $ | 3,704 |

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