Customize my custom taxonomy table in Admin panel

This should do the trick:

add_action( 'admin_print_styles', 'cor_admin_print_styles', 200 );
function cor_admin_print_styles() {
    $screen = get_current_screen();
    if ( 'edit-tags' === $screen->base && 'department' === $screen->taxonomy ) {
        echo <<<EOF
<style>
    .fixed .column-posts {
        width: auto;
    }
    .widefat .num, .column-comments, .column-links, .column-posts {
        text-align: left;
    }
</style>
EOF;
    }
}