(In thousands)	Maturity Dates	March 31, 2021		December 31, 2020
Unsecured private placement notes
3.95% (net of unamortized debt issuance cost of $262 and $273 for 2021 and 2020, respectively)	2021-2027	$	99,738	$	99,727
3.86% (net of unamortized debt issuance cost of $222 and $236 for 2021 and 2020, respectively)	2021-2025		71,207		71,193
4.86% (net of unamortized debt issuance cost of $98 and $108 for 2021 and 2020, respectively)	2021-2023		27,759		27,749
Revolving credit facility borrowing	2021		45,000		—
Debt of foreign subsidiaries
Unsecured bank debt, foreign currency	2021		4,668		—
Total debt		$	248,372	$	198,669
Less current maturities			87,525		37,857
Long-term debt		$	160,847	$	160,812

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 March 31, 2021, the Company had outstanding borrowing totaling $45,000,000 with the weighted average interest rate of 1.36 percent and outstanding letters of credit totaling $6,767,000. There was $298,233,000 available under the revolving credit agreement as of March 31, 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 $407,026,000 and $373,884,000 at March 31, 2021 and December 31, 2020, respectively.