What is the fine-grained topic of the following text: MONACO, September 17, 2013 - Navios Maritime Partners L.P. ("Navios Partners") (NYSE: NMM) an owner and operator of dry cargo vessels, announced today that the Navios Joy, a newbuilding capsize vessel of 181,389 dwt, was delivered to Navios Partners' owned fleet on September 11, 2013. Only return the topic.
Delivery of the newbuilding capsize vessel Navios Joy to Navios Maritime Partners' fleet