Bootstrap 3.1 Dropdown overlapped by panel

dropdown menu's are being overlapped by the panel-collapse container

by bizamajig

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script>
<div class="panel-group">
      <div class="panel panel-default">
        <div class="panel-heading hover-link" data-toggle="collapse" data-parent="false" data-target="#collapseTableOne">
          <h4 class="panel-title">
            Collapsible Table Group Item #1
          </h4>
        </div>
        <div id="collapseTableOne" class="panel-collapse collapse in">
          <div class="panel-body">
            <table class="table table-striped table-condensed table-hover">
              <thead>
                <tr>
                  <th><input type="checkbox"></th>
                  <th>ID</th>
                  <th>First Name</th>
                  <th>Last Name</th>
                  <th>Username</th>
                  <th></th>
                </tr>
              </thead>
              <tbody>
                <tr>
                  <td><input type="checkbox"></td>
                  <td>0521</td>
                  <td>Frank</td>
                  <td>Jackson</td>
                  <td>fjackson</td>
                  <td class="text-right">
                    <div class="dropdown">
                      <a data-toggle="dropdown" href="#">Actions</a>
                      <ul class="dropdown-menu dropdown-menu-right" role="menu" aria-labelledby="dLabel">
                        <li><a href="#">Action</a></li>
                        <li><a href="#">Different Action</a></li>
                        <li><a href="#">Another Option</a></li>
                        <li><a href="#">Yet Another Action</a></li>
                      </ul>
                    </div>
                </td>
                </tr>
                <tr>
                  <td><input type="checkbox"></td>
                  <td>0522</td>
                  <td>Herman</td>
                  <td>Francais</td>
           ...