(In thousands)	Maturity Dates	June 30, 2021		December 31, 2020
Unsecured private placement notes
3.95% (net of unamortized debt issuance cost of $251 and $273 for 2021 and 2020, respectively)	2021-2027	$	99,749	$	99,727
3.86% (net of unamortized debt issuance cost of $208 and $236 for 2021 and 2020, respectively)	2021-2025		56,935		71,193
4.86% (net of unamortized debt issuance cost of $89 and $108 for 2021 and 2020, respectively)	2021-2023		27,768		27,749
2.30% (net of unamortized debt issuance cost of $66 and $0 for 2021 and 2020, respectively)	2024-2028		49,934		—
Debt of foreign subsidiaries
Unsecured bank debt, foreign currency	2021		4,495		—
Total debt		$	238,881	$	198,669
Less current maturities			42,352		37,857
Long-term debt		$	196,529	$	160,812

On June 10, 2021, the Company entered into a note purchase agreement pursuant to which it issued and sold $50,000,000 in aggregate principal amount of 2.30% Senior Notes, Series 2021-A, due June 10, 2028 (the Series 2021-A Notes). The Series 2021-A Notes bear interest at a fixed rate of 2.30%, with interest to be paid semi-annually and with equal annual principal payments beginning on June 10, 2024 and continuing through final maturity on June 10, 2028. The proceeds of the issuance of the Series 2021-A Notes are being used primarily for capital expenditures, to pay down existing debt and for other corporate purposes. This note purchase agreement requires the maintenance of certain financial ratios and covenants that are substantially similar to the Company’s existing long-term debt and provides for customary events of default.

The Company has a committed $350,000,000 multi-currency revolving credit agreement that expires on January 30, 2023. 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, 2021, the Company had outstanding letters of credit totaling $6,993,000 and no borrowings under the revolving credit agreement. There was $343,007,000 available under the revolving credit agreement as of June 30, 2021.

The Company’s loan agreements contain provisions which, among others, 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 $434,265,000 and $373,884,000 at June 30, 2021 and December 31, 2020, respectively.