Então, tenho uma tabela com este estilo:

table-layout: fixed;

Que faz com que todas as colunas tenham a mesma largura. Eu gostaria que uma coluna (a primeira) fosse mais larga e, em seguida, o restante das colunas ocupasse a largura restante da tabela com larguras iguai

Como conseguir isso?

table {
  border-collapse: collapse;
  width: 100%;
  border: 1px solid black;
  background: #ddd;
  table-layout: fixed;
}

table th, table td {
  border: 1px solid #000;
}

table td.wideRow, table th.wideRow {
  width: 300px;
}

<table class="CalendarReservationsBodyTable">
  <thead>
    <tr>
      <th colspan="97">Rezervovane auta</th>
    </tr>
    <tr>
      <th class="corner wideRow">Auto</th>
      <th class="odd" colspan="4">0</th>
      <th class="" colspan="4">1</th>
      <th class="odd" colspan="4">2</th>
      <th class="" colspan="4">3</th>
      <th class="odd" colspan="4">4</th>
      <th class="" colspan="4">5</th>
      <th class="odd" colspan="4">6</th>
      <th class="" colspan="4">7</th>
      <th class="odd" colspan="4">8</th>
      <th class="" colspan="4">9</th>
      <th class="odd" colspan="4">10</th>
      <th class="" colspan="4">11</th>
      <th class="odd" colspan="4">12</th>
      <th class="" colspan="4">13</th>
      <th class="odd" colspan="4">14</th>
      <th class="" colspan="4">15</th>
      <th class="odd" colspan="4">16</th>
      <th class="" colspan="4">17</th>
      <th class="odd" colspan="4">18</th>
      <th class="" colspan="4">19</th>
      <th class="odd" colspan="4">20</th>
      <th class="" colspan="4">21</th>
      <th class="odd" colspan="4">22</th>
      <th class="" colspan="4">23</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td class="alignRight wideRow">KE-260 FC - Octavia combi</td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td colspan="16" class="highlighted borderLeft" title="Richard Knop">
        Richard Knop
      </td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td colspan="14" class="highlighted" title="Richard Knop">
        Richard Knop
      </td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
      <td class=" borderLeft"></td>
      <td class="odd"></td>
      <td class=""></td>
      <td class="odd"></td>
    </tr>
  </tbody>
</table>

jsfiddle:http: //jsfiddle.net/6p9K3

Observe a primeira coluna, eu quero que seja300px Largo