At June 30, 2023 and December 31, 2022, debt was comprised of the following:


(In thousands)	Maturity Dates	June 30, 2023		December 31, 2022
Senior unsecured notes
3.95% (net of unamortized debt issuance cost of $164 and $186 for 2023 and 2022, respectively)	2023-2027	$	71,265	$	71,243
3.86% (net of unamortized debt issuance cost of $98 and $125 for 2023 and 2022, respectively)	2023-2025		28,473		42,732
4.86% (net of unamortized debt issuance cost of $0 and $30 for 2023 and 2022, respectively)	2023		9,286		9,260
2.30% (net of unamortized debt issuance cost of $110 and $122 for 2023 and 2022, respectively)	2024-2028		49,890		49,878
2.37% (net of unamortized debt issuance cost of $117 and $128 for 2023 and 2022, respectively)	2024-2028		49,883		49,872
2.73% (net of unamortized debt issuance cost of $97 and $55 for 2023 and 2022, respectively)	2025-2031		99,903		99,945
2.83% (net of unamortized debt issuance cost of $74 and $40 for 2023 and 2022, respectively)	2026-2032		74,926		74,960
Revolving credit facility and term loan borrowing	2023-2027		294,000		189,250
Debt of foreign subsidiaries
Unsecured bank debt, foreign currency	2023		5,003		—
Total debt		$	682,629	$	587,140
Less current maturities			244,360		132,111
Long-term debt		$	438,269	$	455,029

The Company's long-term debt financing is currently comprised of certain senior unsecured notes issued to insurance companies in private placement transactions, totaling $383,626,000 as of June 30, 2023. These notes are denominated in U.S. dollars and have fixed interest rates ranging from 2.30 percent to 4.86 percent. The notes had original maturities of seven to 12 years with mandatory principal payments beginning four, five and six years after issuance. The Company will be required to make principal payments on the currently outstanding notes from 2023 to 2032.

The Company's credit agreement with a syndicate of banks provides for credit facilities in an initial aggregate principal amount of $450,000,000, consisting of (a) a $350,000,000 multi-currency revolving credit facility and (b) a $100,000,000 delayed draw term loan credit facility, each of which matures on June 24, 2027. The Company maintains import letters of credit, and standby letters of credit under its workers’ compensation insurance agreements and for other purposes, as needed from time to time, which are issued under the revolving credit agreement. As of June 30, 2023, the Company had outstanding letters of credit totaling $11,331,000 and $294,000,000 of outstanding borrowings under the credit agreement, inclusive of a $97,500,000 delayed draw term loan ($2,500,000 of the term loan principal has been permanently repaid as scheduled). There was $142,169,000 available under the credit agreement as of June 30, 2023.

The Company’s material debt agreements contain provisions which, among other covenants, require maintenance of certain financial ratios and place limitations on additional debt, investments and payment of dividends. Based on the loan agreement provisions that place limitations on dividend payments, unrestricted retained earnings (i.e., retained earnings available for dividend distribution) were $238,614,000 and $224,189,000 at June 30, 2023 and December 31, 2022, respectively.