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Debt and Credit Agreement (Tables)
 9 Months Ended
Sep. 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(823)
Balance as of September 30, 2021$3,430