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Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The following table details the Company’s long-term debt at the respective principal amounts, net of unamortized debt issuance costs on the senior unsecured notes (in thousands):

As of September 30,As of
December 31,
202120202020
Revolving unsecured credit facility, maturing 2024 (1)
$246,000 $40,000 $123,000 
4.625% senior unsecured notes due 2028 (2)
493,499 492,775 492,916 
Total long-term debt$739,499 $532,775 $615,916 

(1)Debt issuance costs related to the Company’s revolving unsecured credit facilities are included in other assets in the accompanying consolidated balance sheets.
(2)As of September 30, 2021, 2020 and December 31, 2020, deferred debt issuance costs of $6.5 million, $7.2 million and $7.1 million, respectively, are included as a direct deduction from the carrying amount of the senior unsecured notes due 2028 in the accompanying consolidated balance sheets.