(In thousands)	Maturity Dates	March 31, 2019		December 31, 2018
Unsecured private placement notes
3.95% (net of unamortized debt issuance cost of $349 and $360 for 2019 and 2018, respectively)	2021-2027	$	99,651	$	99,640
3.86% (net of unamortized debt issuance cost of $333 and $347 for 2019 and 2018, respectively)	2019-2025		99,667		99,653
4.86% (net of unamortized debt issuance cost of $176 and $186 for 2019 and 2018, respectively)	2019-2023		46,253		46,243
5.88% (net of unamortized debt issuance cost of $80 and $85 for 2019 and 2018, respectively)	2019-2022		22,777		22,772
Debt of foreign subsidiaries
Unsecured bank debt, foreign currency	2019		3,514		7,772
Total debt		$	271,862	$	276,080
Less current maturities			32,799		37,058
Long-term debt		$	239,063	$	239,022

The Company has a committed $350,000,000 multi-currency revolving credit agreement that expires on January 30, 2023. The Company maintains 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, 2019, the Company had outstanding letters of credit totaling $5,271,000 and no outstanding debt under this agreement. There was $344,729,000 available under the revolving credit agreement as of March 31, 2019.

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 $235,249,000 and $214,101,000 at March 31, 2019 and December 31, 2018, respectively.