See the story of their capture, several weeks ago, here.
Citing confidentiality, no details have been released relative to ransom demands, payment, or anything else about how the release was negotiated. Bourbon thanked those who supported and encouraged them while bringing about the men's release, including the Nigerian authorities and the Nigerian, Russian, Estonian, Luxemburg and French Governments.
We're glad these men have been so quickly freed! It powerfully demonstrates the importance of a company committed to vigorous action on behalf of their employees in harms way - and it shows the good that can be done by national governments who step forward to support their own captured citizens.
Someone cared about these men, took action, and now they are free. I wish every hostage situation could end as well as this one!