The biggest issue with enlargening the logo is that it is within a defined container that impacts the entire header, so you need to adjust them as well which makes the upkeep pretty extensive. I do allow some basic changing in the CSS Configuration Wizard tool on Fark.Tools to try and simplify it a bit for you, but it is not perfect either depending on what size you are scaling too.

@mark.brumley - Have you tried the suggestion at this post?

Thank you for the reply. This works pretty well:

doc-layout-internal-header .internal-header-logo a {
    height: 54px !important;
}
doc-layout-internal-header{
    height: 4.25rem !important;
}

doc-layout-internal-header .internal-header-logo a {
    height: 54px !important;
}
doc-layout-internal-header{
    height: 4.25rem !important;
}

Just be careful with looking at different screen sizes and things with the referential sizing types. Can push things around a bit. This one was by far the trickiest one to abstract for most users when building the initial CSS Wizard Tool. 

In addition to Bfarkas’s

doc-layout-internal-header .internal-header-logo a {
    height: 54px !important;
}
doc-layout-internal-header{
    height: 4.25rem !important;
}

In addition to this answer, you may need to bit more spacing around your logo. The following may be helpful to add…

.internal-header-logo {
min-height:54px;
}