Get all checked checkboxes values

i have the following form:

<%= form_for([company,service], :remote => true) do |f| %>
    <%= health_care_insurances.each do |hc_insurance| %>
        <label><%= hc_insurance.name %></label>
        <input id="health_care_insurance_<%= user.id %>" name="<%= hc_insurance.id %>" value="<%= hc_insurance.id %>" type="checkbox"><br/>
    <% end %>
    ...
<% end %>

When it's submited, and for the sake of good performance, i would like to get an array with all "hc_insurance.ids" that are checked. I know i might use javascript to add them to a hidden_field and then pick them up from there, but im not sure that's a good way to go.

Is there any rails way to pick them up from the controller?