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    <nameOfIssuer>Aegion Corp.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>00770F104</cusip>
    <value>21492</value>
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    <nameOfIssuer>AGCO Corp.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>001084102</cusip>
    <value>59095</value>
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    <nameOfIssuer>Belden Inc</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>077454106</cusip>
    <value>26971</value>
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      <sshPrnamt>505647</sshPrnamt>
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      <Sole>469487</Sole>
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      <None>36160</None>
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  <infoTable>
    <nameOfIssuer>Brink's Co.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>109696104</cusip>
    <value>75193</value>
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      <sshPrnamt>906481</sshPrnamt>
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      <Sole>785041</Sole>
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      <None>121440</None>
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    <nameOfIssuer>Broadridge Financial Solutions, Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>11133T103</cusip>
    <value>34860</value>
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      <sshPrnamt>280159</sshPrnamt>
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    <votingAuthority>
      <Sole>243791</Sole>
      <Shared>0</Shared>
      <None>36368</None>
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  </infoTable>
  <infoTable>
    <nameOfIssuer>Centene Corp.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>15135B101</cusip>
    <value>35461</value>
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      <sshPrnamt>819723</sshPrnamt>
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      <Sole>671412</Sole>
      <Shared>0</Shared>
      <None>148311</None>
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    <nameOfIssuer>Clean Harbors Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>184496107</cusip>
    <value>65723</value>
    <shrsOrPrnAmt>
      <sshPrnamt>851330</sshPrnamt>
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      <Sole>737157</Sole>
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      <None>114173</None>
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    <nameOfIssuer>Crane Co</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>224399105</cusip>
    <value>52442</value>
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      <sshPrnamt>650397</sshPrnamt>
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    <votingAuthority>
      <Sole>555545</Sole>
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      <None>94852</None>
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    <nameOfIssuer>Darling Ingredients Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>237266101</cusip>
    <value>79409</value>
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      <sshPrnamt>4151021</sshPrnamt>
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      <Sole>3597291</Sole>
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      <None>553730</None>
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    <nameOfIssuer>Dycom Industries Inc</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>267475101</cusip>
    <value>84210</value>
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      <sshPrnamt>1649560</sshPrnamt>
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      <Sole>1427444</Sole>
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      <None>222116</None>
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    <nameOfIssuer>Encana Corp</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>292505104</cusip>
    <value>33918</value>
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      <Sole>6390528</Sole>
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      <None>982849</None>
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    <nameOfIssuer>Enerpac Tool Group</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>00508X203</cusip>
    <value>21417</value>
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      <sshPrnamt>976167</sshPrnamt>
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      <Sole>906077</Sole>
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      <None>70090</None>
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    <nameOfIssuer>Extended Stay America, Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>30224P200</cusip>
    <value>65564</value>
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      <sshPrnamt>4478383</sshPrnamt>
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    <votingAuthority>
      <Sole>3882666</Sole>
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      <None>595717</None>
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    <nameOfIssuer>First Horizon National Corp</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>320517105</cusip>
    <value>21919</value>
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      <sshPrnamt>1353005</sshPrnamt>
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    <votingAuthority>
      <Sole>1066031</Sole>
      <Shared>0</Shared>
      <None>286974</None>
    </votingAuthority>
  </infoTable>
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    <nameOfIssuer>Hanesbrands Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>410345102</cusip>
    <value>33588</value>
    <shrsOrPrnAmt>
      <sshPrnamt>2192409</sshPrnamt>
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      <Sole>1727135</Sole>
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      <None>465274</None>
    </votingAuthority>
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    <nameOfIssuer>Hill-Rom Holdings Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>431475102</cusip>
    <value>27648</value>
    <shrsOrPrnAmt>
      <sshPrnamt>262743</sshPrnamt>
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      <Sole>243927</Sole>
      <Shared>0</Shared>
      <None>18816</None>
    </votingAuthority>
  </infoTable>
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    <nameOfIssuer>IDEX Corp.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>45167R104</cusip>
    <value>25813</value>
    <shrsOrPrnAmt>
      <sshPrnamt>157513</sshPrnamt>
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      <Sole>123932</Sole>
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      <None>33581</None>
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  <infoTable>
    <nameOfIssuer>Knowles Corporation</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>49926D109</cusip>
    <value>26048</value>
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      <sshPrnamt>1280620</sshPrnamt>
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      <Sole>1007754</Sole>
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      <None>272866</None>
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    <nameOfIssuer>Koppers Holdings Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>50060P106</cusip>
    <value>32781</value>
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      <sshPrnamt>1122242</sshPrnamt>
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      <Sole>1052989</Sole>
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      <None>69253</None>
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    <nameOfIssuer>Murphy USA Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>626755102</cusip>
    <value>30000</value>
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      <sshPrnamt>351698</sshPrnamt>
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      <Sole>302502</Sole>
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    <nameOfIssuer>Polaris Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>731068102</cusip>
    <value>46636</value>
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      <sshPrnamt>529898</sshPrnamt>
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      <Sole>452382</Sole>
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      <None>77516</None>
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    <nameOfIssuer>Sanderson Farms Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>800013104</cusip>
    <value>26036</value>
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      <sshPrnamt>172050</sshPrnamt>
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      <Sole>159758</Sole>
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    </votingAuthority>
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    <nameOfIssuer>SEI Investments Co</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>784117103</cusip>
    <value>11226</value>
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    <nameOfIssuer>Stepan Co</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>858586100</cusip>
    <value>17997</value>
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      <sshPrnamt>185421</sshPrnamt>
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    <nameOfIssuer>Thor Industries Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>885160101</cusip>
    <value>53526</value>
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    <nameOfIssuer>Timken Co.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
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    <nameOfIssuer>Trinity Industries Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>896522109</cusip>
    <value>50286</value>
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    <nameOfIssuer>Watsco Inc</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>942622200</cusip>
    <value>9923</value>
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      <Sole>46400</Sole>
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    </votingAuthority>
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    <nameOfIssuer>Western Union Co.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>959802109</cusip>
    <value>30534</value>
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      <Sole>1077655</Sole>
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    <nameOfIssuer>WestRock Co</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>96145D105</cusip>
    <value>31398</value>
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      <sshPrnamt>861386</sshPrnamt>
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      <Sole>678704</Sole>
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      <None>182682</None>
    </votingAuthority>
  </infoTable>
</informationTable>
