<informationTable xmlns="http://www.sec.gov/edgar/document/thirteenf/informationtable" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <infoTable>
       <nameOfIssuer>2U Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>90214J101</cusip>
       <value>161518</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2279721</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1300054</Sole>
           <Shared>0</Shared>
           <None>979667</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>A. O. Smith Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>831865209</cusip>
       <value>37877</value>
       <shrsOrPrnAmt>
           <sshPrnamt>710373</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>476533</Sole>
           <Shared>0</Shared>
           <None>233840</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>ABIOMED Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>003654100</cusip>
       <value>52859</value>
       <shrsOrPrnAmt>
           <sshPrnamt>185087</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>125144</Sole>
           <Shared>0</Shared>
           <None>59943</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Acacia Communications Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>00401C108</cusip>
       <value>24150</value>
       <shrsOrPrnAmt>
           <sshPrnamt>421093</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>241116</Sole>
           <Shared>0</Shared>
           <None>179977</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Acadia Healthcare Company Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>00404A109</cusip>
       <value>20747</value>
       <shrsOrPrnAmt>
           <sshPrnamt>707858</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>405326</Sole>
           <Shared>0</Shared>
           <None>302532</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Actuant Corporation Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>00508X203</cusip>
       <value>40639</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1667574</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>739078</Sole>
           <Shared>0</Shared>
           <None>928496</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Advance Auto Parts Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>00751Y106</cusip>
       <value>54172</value>
       <shrsOrPrnAmt>
           <sshPrnamt>317671</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>213582</Sole>
           <Shared>0</Shared>
           <None>104089</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Advanced Micro Devices Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>007903107</cusip>
       <value>67844</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2658453</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1762139</Sole>
           <Shared>0</Shared>
           <None>896314</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Aerie Pharmaceuticals Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>00771V108</cusip>
       <value>15465</value>
       <shrsOrPrnAmt>
           <sshPrnamt>325572</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>56815</Sole>
           <Shared>0</Shared>
           <None>268757</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Agnico Eagle Mines Limited</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>008474108</cusip>
       <value>18047</value>
       <shrsOrPrnAmt>
           <sshPrnamt>414874</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>237769</Sole>
           <Shared>0</Shared>
           <None>177105</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Alaska Air Group Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>011659109</cusip>
       <value>1964</value>
       <shrsOrPrnAmt>
           <sshPrnamt>35000</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>20023</Sole>
           <Shared>0</Shared>
           <None>14977</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Albemarle Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>012653101</cusip>
       <value>15420</value>
       <shrsOrPrnAmt>
           <sshPrnamt>188097</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>107850</Sole>
           <Shared>0</Shared>
           <None>80247</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Align Technology Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>016255101</cusip>
       <value>57395</value>
       <shrsOrPrnAmt>
           <sshPrnamt>201861</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>136425</Sole>
           <Shared>0</Shared>
           <None>65436</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Alkermes Plc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G01767105</cusip>
       <value>3339</value>
       <shrsOrPrnAmt>
           <sshPrnamt>91507</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>13842</Sole>
           <Shared>0</Shared>
           <None>77665</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Allegheny Technologies Incorporated</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>01741R102</cusip>
       <value>230092</value>
       <shrsOrPrnAmt>
           <sshPrnamt>8998522</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>4856166</Sole>
           <Shared>0</Shared>
           <None>4142356</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Alliance Data Systems Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>018581108</cusip>
       <value>26649</value>
       <shrsOrPrnAmt>
           <sshPrnamt>152300</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>101809</Sole>
           <Shared>0</Shared>
           <None>50491</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Alnylam Pharmaceuticals Inc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>02043Q107</cusip>
       <value>6366</value>
       <shrsOrPrnAmt>
           <sshPrnamt>68126</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>10293</Sole>
           <Shared>0</Shared>
           <None>57833</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Alteryx Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>02156B103</cusip>
       <value>3602</value>
       <shrsOrPrnAmt>
           <sshPrnamt>42944</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>6497</Sole>
           <Shared>0</Shared>
           <None>36447</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Altra Industrial Motion Corp.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>02208R106</cusip>
       <value>29724</value>
       <shrsOrPrnAmt>
           <sshPrnamt>957285</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>427310</Sole>
           <Shared>0</Shared>
           <None>529975</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Amarin Corporation Plc Sponsored ADR</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>023111206</cusip>
       <value>21211</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1021731</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>154650</Sole>
           <Shared>0</Shared>
           <None>867081</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>American Airlines Group Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>02376R102</cusip>
       <value>39529</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1244609</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>712638</Sole>
           <Shared>0</Shared>
           <None>531971</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>American Woodmark Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>030506109</cusip>
       <value>10174</value>
       <shrsOrPrnAmt>
           <sshPrnamt>123131</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>18595</Sole>
           <Shared>0</Shared>
           <None>104536</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Amneal Pharmaceuticals Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>03168L105</cusip>
       <value>11347</value>
       <shrsOrPrnAmt>
           <sshPrnamt>800781</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>458020</Sole>
           <Shared>0</Shared>
           <None>342761</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Amphenol Corporation Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>032095101</cusip>
       <value>67116</value>
       <shrsOrPrnAmt>
           <sshPrnamt>710677</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>480104</Sole>
           <Shared>0</Shared>
           <None>230573</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Anaplan Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>03272L108</cusip>
       <value>11498</value>
       <shrsOrPrnAmt>
           <sshPrnamt>292133</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>44219</Sole>
           <Shared>0</Shared>
           <None>247914</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Aon plc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G0408V102</cusip>
       <value>77390</value>
       <shrsOrPrnAmt>
           <sshPrnamt>453369</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>306022</Sole>
           <Shared>0</Shared>
           <None>147347</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Appian Corporation Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>03782L101</cusip>
       <value>6158</value>
       <shrsOrPrnAmt>
           <sshPrnamt>178851</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>27064</Sole>
           <Shared>0</Shared>
           <None>151787</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Aqua Metals Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>03837J101</cusip>
       <value>2855</value>
       <shrsOrPrnAmt>
           <sshPrnamt>930042</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>537289</Sole>
           <Shared>0</Shared>
           <None>392753</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Argo Group International Holdings Ltd.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G0464B107</cusip>
       <value>98751</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1397552</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>576059</Sole>
           <Shared>0</Shared>
           <None>821493</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Arista Networks Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>040413106</cusip>
       <value>47514</value>
       <shrsOrPrnAmt>
           <sshPrnamt>151098</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>102040</Sole>
           <Shared>0</Shared>
           <None>49058</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Array BioPharma Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>04269X105</cusip>
       <value>8352</value>
       <shrsOrPrnAmt>
           <sshPrnamt>342571</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>51760</Sole>
           <Shared>0</Shared>
           <None>290811</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Artisan Partners Asset Management Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>04316A108</cusip>
       <value>13772</value>
       <shrsOrPrnAmt>
           <sshPrnamt>547163</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>313219</Sole>
           <Shared>0</Shared>
           <None>233944</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>At Home Group Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>04650Y100</cusip>
       <value>5261</value>
       <shrsOrPrnAmt>
           <sshPrnamt>294551</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>44539</Sole>
           <Shared>0</Shared>
           <None>250012</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Autodesk Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>052769106</cusip>
       <value>93517</value>
       <shrsOrPrnAmt>
           <sshPrnamt>600162</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>405565</Sole>
           <Shared>0</Shared>
           <None>194597</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Axogen Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>05463X106</cusip>
       <value>7402</value>
       <shrsOrPrnAmt>
           <sshPrnamt>351460</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>53172</Sole>
           <Shared>0</Shared>
           <None>298288</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Azul S.A. Sponsored ADR Pfd</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>05501U106</cusip>
       <value>45922</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1572137</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>719915</Sole>
           <Shared>0</Shared>
           <None>852222</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Ball Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>058498106</cusip>
       <value>174410</value>
       <shrsOrPrnAmt>
           <sshPrnamt>3014344</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>2033848</Sole>
           <Shared>0</Shared>
           <None>980496</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Bancorp Inc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>05969A105</cusip>
       <value>35024</value>
       <shrsOrPrnAmt>
           <sshPrnamt>4334681</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1932432</Sole>
           <Shared>0</Shared>
           <None>2402249</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Beacon Roofing Supply Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>073685109</cusip>
       <value>118328</value>
       <shrsOrPrnAmt>
           <sshPrnamt>3679368</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>2114192</Sole>
           <Shared>0</Shared>
           <None>1565176</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Benefitfocus Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>08180D106</cusip>
       <value>81064</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1637000</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>566106</Sole>
           <Shared>0</Shared>
           <None>1070894</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Berry Global Group Inc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>08579W103</cusip>
       <value>22076</value>
       <shrsOrPrnAmt>
           <sshPrnamt>409801</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>234452</Sole>
           <Shared>0</Shared>
           <None>175349</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>BioMarin Pharmaceutical Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>09061G101</cusip>
       <value>96559</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1087011</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>666902</Sole>
           <Shared>0</Shared>
           <None>420109</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>BlackLine Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>09239B109</cusip>
       <value>1946</value>
       <shrsOrPrnAmt>
           <sshPrnamt>42014</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>6354</Sole>
           <Shared>0</Shared>
           <None>35660</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>bluebird bio Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>09609G100</cusip>
       <value>23152</value>
       <shrsOrPrnAmt>
           <sshPrnamt>147158</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>22268</Sole>
           <Shared>0</Shared>
           <None>124890</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>BMC Stock Holdings Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>05591B109</cusip>
       <value>62819</value>
       <shrsOrPrnAmt>
           <sshPrnamt>3555113</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1624756</Sole>
           <Shared>0</Shared>
           <None>1930357</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Boot Barn Holdings Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>099406100</cusip>
       <value>42428</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1441173</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>573923</Sole>
           <Shared>0</Shared>
           <None>867250</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Bright Horizons Family Solutions Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>109194100</cusip>
       <value>61775</value>
       <shrsOrPrnAmt>
           <sshPrnamt>485997</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>338321</Sole>
           <Shared>0</Shared>
           <None>147676</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Brightcove Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>10921T101</cusip>
       <value>23128</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2750052</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1580296</Sole>
           <Shared>0</Shared>
           <None>1169756</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Burlington Stores Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>122017106</cusip>
       <value>53526</value>
       <shrsOrPrnAmt>
           <sshPrnamt>341629</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>230485</Sole>
           <Shared>0</Shared>
           <None>111144</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>BWX Technologies Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>05605H100</cusip>
       <value>45975</value>
       <shrsOrPrnAmt>
           <sshPrnamt>927288</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>634956</Sole>
           <Shared>0</Shared>
           <None>292332</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Capri Holdings Limited</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G1890L107</cusip>
       <value>60883</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1330780</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>804722</Sole>
           <Shared>0</Shared>
           <None>526058</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Cardiovascular Systems Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>141619106</cusip>
       <value>25833</value>
       <shrsOrPrnAmt>
           <sshPrnamt>668220</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>382601</Sole>
           <Shared>0</Shared>
           <None>285619</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Cardlytics Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>14161W105</cusip>
       <value>26981</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1631248</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>595871</Sole>
           <Shared>0</Shared>
           <None>1035377</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>CareDx Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>14167L103</cusip>
       <value>2064</value>
       <shrsOrPrnAmt>
           <sshPrnamt>65496</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>9905</Sole>
           <Shared>0</Shared>
           <None>55591</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Career Education Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>141665109</cusip>
       <value>113796</value>
       <shrsOrPrnAmt>
           <sshPrnamt>6888406</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>3287622</Sole>
           <Shared>0</Shared>
           <None>3600784</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Carpenter Technology Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>144285103</cusip>
       <value>50752</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1106922</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>473651</Sole>
           <Shared>0</Shared>
           <None>633271</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Carrizo Oil &amp; Gas Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>144577103</cusip>
       <value>22020</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1765846</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>780286</Sole>
           <Shared>0</Shared>
           <None>985560</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Carvana Co. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>146869102</cusip>
       <value>43306</value>
       <shrsOrPrnAmt>
           <sshPrnamt>745879</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>474047</Sole>
           <Shared>0</Shared>
           <None>271832</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Centennial Resource Development Inc. C</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>15136A102</cusip>
       <value>44535</value>
       <shrsOrPrnAmt>
           <sshPrnamt>5066515</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>2755477</Sole>
           <Shared>0</Shared>
           <None>2311038</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Century Communities Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>156504300</cusip>
       <value>25987</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1084160</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>353342</Sole>
           <Shared>0</Shared>
           <None>730818</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Cintas Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>172908105</cusip>
       <value>129608</value>
       <shrsOrPrnAmt>
           <sshPrnamt>641273</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>432740</Sole>
           <Shared>0</Shared>
           <None>208533</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Cloudera Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>18914U100</cusip>
       <value>6423</value>
       <shrsOrPrnAmt>
           <sshPrnamt>587078</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>336575</Sole>
           <Shared>0</Shared>
           <None>250503</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Coeur Mining Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>192108504</cusip>
       <value>2987</value>
       <shrsOrPrnAmt>
           <sshPrnamt>732202</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>382904</Sole>
           <Shared>0</Shared>
           <None>349298</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Cogent Communications Holdings Inc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>19239V302</cusip>
       <value>45453</value>
       <shrsOrPrnAmt>
           <sshPrnamt>837847</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>479906</Sole>
           <Shared>0</Shared>
           <None>357941</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Compass Minerals International Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>20451N101</cusip>
       <value>11568</value>
       <shrsOrPrnAmt>
           <sshPrnamt>212773</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>122013</Sole>
           <Shared>0</Shared>
           <None>90760</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Concho Resources Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>20605P101</cusip>
       <value>53436</value>
       <shrsOrPrnAmt>
           <sshPrnamt>481582</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>320814</Sole>
           <Shared>0</Shared>
           <None>160768</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Conduent Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>206787103</cusip>
       <value>27462</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1985701</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>884568</Sole>
           <Shared>0</Shared>
           <None>1101133</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Controladora Vuela Compania de Aviacio</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>21240E105</cusip>
       <value>32737</value>
       <shrsOrPrnAmt>
           <sshPrnamt>3842346</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>2197066</Sole>
           <Shared>0</Shared>
           <None>1645280</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Cooper Companies Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>216648402</cusip>
       <value>191492</value>
       <shrsOrPrnAmt>
           <sshPrnamt>646561</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>424774</Sole>
           <Shared>0</Shared>
           <None>221787</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Cooper Tire &amp; Rubber Company</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>216831107</cusip>
       <value>38640</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1292746</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>576800</Sole>
           <Shared>0</Shared>
           <None>715946</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Corporate Office Properties Trust</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>22002T108</cusip>
       <value>110180</value>
       <shrsOrPrnAmt>
           <sshPrnamt>4035889</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1912751</Sole>
           <Shared>0</Shared>
           <None>2123138</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Coupa Software Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>22266L106</cusip>
       <value>5842</value>
       <shrsOrPrnAmt>
           <sshPrnamt>64217</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>9655</Sole>
           <Shared>0</Shared>
           <None>54562</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Cousins Properties Incorporated</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>222795106</cusip>
       <value>65272</value>
       <shrsOrPrnAmt>
           <sshPrnamt>6756986</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>3008755</Sole>
           <Shared>0</Shared>
           <None>3748231</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Covanta Holding Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>22282E102</cusip>
       <value>19040</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1099962</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>632136</Sole>
           <Shared>0</Shared>
           <None>467826</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Cree Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>225447101</cusip>
       <value>23207</value>
       <shrsOrPrnAmt>
           <sshPrnamt>405580</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>232274</Sole>
           <Shared>0</Shared>
           <None>173306</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Cushman &amp; Wakefield Plc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G2717B108</cusip>
       <value>4223</value>
       <shrsOrPrnAmt>
           <sshPrnamt>237265</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>35901</Sole>
           <Shared>0</Shared>
           <None>201364</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Cypress Semiconductor Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>232806109</cusip>
       <value>5616</value>
       <shrsOrPrnAmt>
           <sshPrnamt>376439</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>214192</Sole>
           <Shared>0</Shared>
           <None>162247</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Dana Incorporated</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>235825205</cusip>
       <value>46224</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2605644</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1161577</Sole>
           <Shared>0</Shared>
           <None>1444067</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Darling Ingredients Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>237266101</cusip>
       <value>13162</value>
       <shrsOrPrnAmt>
           <sshPrnamt>607954</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>348293</Sole>
           <Shared>0</Shared>
           <None>259661</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Del Taco Restaurants Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>245496104</cusip>
       <value>22090</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2195800</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>977948</Sole>
           <Shared>0</Shared>
           <None>1217852</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>DexCom Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>252131107</cusip>
       <value>37485</value>
       <shrsOrPrnAmt>
           <sshPrnamt>314733</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>195957</Sole>
           <Shared>0</Shared>
           <None>118776</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Diplomat Pharmacy Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>25456K101</cusip>
       <value>6346</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1092180</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>623998</Sole>
           <Shared>0</Shared>
           <None>468182</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>DocuSign Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>256163106</cusip>
       <value>1186</value>
       <shrsOrPrnAmt>
           <sshPrnamt>22882</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>3462</Sole>
           <Shared>0</Shared>
           <None>19420</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Dollar General Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>256677105</cusip>
       <value>172429</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1445342</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>989273</Sole>
           <Shared>0</Shared>
           <None>456069</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Domino&apos;s Pizza Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>25754A201</cusip>
       <value>43926</value>
       <shrsOrPrnAmt>
           <sshPrnamt>170190</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>113824</Sole>
           <Shared>0</Shared>
           <None>56366</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Dril-Quip Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>262037104</cusip>
       <value>6423</value>
       <shrsOrPrnAmt>
           <sshPrnamt>140084</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>80192</Sole>
           <Shared>0</Shared>
           <None>59892</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>DXC Technology Co.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>23355L106</cusip>
       <value>87541</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1361230</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>942599</Sole>
           <Shared>0</Shared>
           <None>418631</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>DXP Enterprises Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>233377407</cusip>
       <value>30417</value>
       <shrsOrPrnAmt>
           <sshPrnamt>781517</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>397161</Sole>
           <Shared>0</Shared>
           <None>384356</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Eagle Materials Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>26969P108</cusip>
       <value>22797</value>
       <shrsOrPrnAmt>
           <sshPrnamt>270428</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>136388</Sole>
           <Shared>0</Shared>
           <None>134040</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Edwards Lifesciences Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>28176E108</cusip>
       <value>137032</value>
       <shrsOrPrnAmt>
           <sshPrnamt>716208</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>467875</Sole>
           <Shared>0</Shared>
           <None>248333</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Eldorado Resorts Inc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>28470R102</cusip>
       <value>172893</value>
       <shrsOrPrnAmt>
           <sshPrnamt>3717064</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>2424054</Sole>
           <Shared>0</Shared>
           <None>1293010</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Electronic Arts Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>285512109</cusip>
       <value>44590</value>
       <shrsOrPrnAmt>
           <sshPrnamt>438753</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>318007</Sole>
           <Shared>0</Shared>
           <None>120746</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Ellie Mae Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>28849P100</cusip>
       <value>30316</value>
       <shrsOrPrnAmt>
           <sshPrnamt>307185</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>202105</Sole>
           <Shared>0</Shared>
           <None>105080</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Encore Wire Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>292562105</cusip>
       <value>60805</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1062659</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>501462</Sole>
           <Shared>0</Shared>
           <None>561197</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>EnerSys</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>29275Y102</cusip>
       <value>17150</value>
       <shrsOrPrnAmt>
           <sshPrnamt>263205</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>117196</Sole>
           <Shared>0</Shared>
           <None>146009</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Ensco Rowan Plc Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G3166L100</cusip>
       <value>11171</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2842603</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1368485</Sole>
           <Shared>0</Shared>
           <None>1474118</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Entegris Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>29362U104</cusip>
       <value>11179</value>
       <shrsOrPrnAmt>
           <sshPrnamt>313230</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>47401</Sole>
           <Shared>0</Shared>
           <None>265829</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Essential Properties Realty Trust Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>29670E107</cusip>
       <value>51120</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2618836</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1108459</Sole>
           <Shared>0</Shared>
           <None>1510377</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Etsy Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>29786A106</cusip>
       <value>9625</value>
       <shrsOrPrnAmt>
           <sshPrnamt>143181</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>21662</Sole>
           <Shared>0</Shared>
           <None>121519</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Euronav NV</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>B38564108</cusip>
       <value>17562</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2154802</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1234270</Sole>
           <Shared>0</Shared>
           <None>920532</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Euronet Worldwide Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>298736109</cusip>
       <value>34394</value>
       <shrsOrPrnAmt>
           <sshPrnamt>241212</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>110808</Sole>
           <Shared>0</Shared>
           <None>130404</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Evercore Inc Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>29977A105</cusip>
       <value>75170</value>
       <shrsOrPrnAmt>
           <sshPrnamt>826043</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>547161</Sole>
           <Shared>0</Shared>
           <None>278882</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Everest Re Group Ltd.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G3223R108</cusip>
       <value>21658</value>
       <shrsOrPrnAmt>
           <sshPrnamt>100289</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>57384</Sole>
           <Shared>0</Shared>
           <None>42905</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Exact Sciences Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>30063P105</cusip>
       <value>85549</value>
       <shrsOrPrnAmt>
           <sshPrnamt>987638</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>520374</Sole>
           <Shared>0</Shared>
           <None>467264</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Exelixis Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>30161Q104</cusip>
       <value>67169</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2822208</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1312447</Sole>
           <Shared>0</Shared>
           <None>1509761</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Fabrinet</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G3323L100</cusip>
       <value>57445</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1097112</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>519742</Sole>
           <Shared>0</Shared>
           <None>577370</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Ferroglobe PLC</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G33856108</cusip>
       <value>7583</value>
       <shrsOrPrnAmt>
           <sshPrnamt>3699093</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>2124241</Sole>
           <Shared>0</Shared>
           <None>1574852</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>First Bancorp</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>318672706</cusip>
       <value>113372</value>
       <shrsOrPrnAmt>
           <sshPrnamt>9892838</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>4663773</Sole>
           <Shared>0</Shared>
           <None>5229065</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>First Horizon National Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>320517105</cusip>
       <value>74675</value>
       <shrsOrPrnAmt>
           <sshPrnamt>5341531</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>2490805</Sole>
           <Shared>0</Shared>
           <None>2850726</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Flex Ltd.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>Y2573F102</cusip>
       <value>18327</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1832669</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1050915</Sole>
           <Shared>0</Shared>
           <None>781754</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Floor &amp; Decor Holdings Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>339750101</cusip>
       <value>68216</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1654918</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>932516</Sole>
           <Shared>0</Shared>
           <None>722402</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Flushing Financial Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>343873105</cusip>
       <value>56165</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2561121</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1168560</Sole>
           <Shared>0</Shared>
           <None>1392561</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>FMC Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>302491303</cusip>
       <value>172698</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2248087</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1495256</Sole>
           <Shared>0</Shared>
           <None>752831</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Forterra Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>34960W106</cusip>
       <value>10420</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2469219</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1414576</Sole>
           <Shared>0</Shared>
           <None>1054643</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>GasLog Ltd.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G37585109</cusip>
       <value>25991</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1488586</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>777107</Sole>
           <Shared>0</Shared>
           <None>711479</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Global Eagle Entertainment Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>37951D102</cusip>
       <value>4210</value>
       <shrsOrPrnAmt>
           <sshPrnamt>5934107</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>3399307</Sole>
           <Shared>0</Shared>
           <None>2534800</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Global Payments Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>37940X102</cusip>
       <value>256919</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1881916</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1273732</Sole>
           <Shared>0</Shared>
           <None>608184</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>GMS Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>36251C103</cusip>
       <value>10482</value>
       <shrsOrPrnAmt>
           <sshPrnamt>693259</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>104883</Sole>
           <Shared>0</Shared>
           <None>588376</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Gogo Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>38046C109</cusip>
       <value>10479</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2333801</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1339574</Sole>
           <Shared>0</Shared>
           <None>994227</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Golar LNG Limited</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G9456A100</cusip>
       <value>9266</value>
       <shrsOrPrnAmt>
           <sshPrnamt>439368</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>251743</Sole>
           <Shared>0</Shared>
           <None>187625</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Granite Construction Incorporated</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>387328107</cusip>
       <value>11884</value>
       <shrsOrPrnAmt>
           <sshPrnamt>275415</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>157658</Sole>
           <Shared>0</Shared>
           <None>117757</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Graphic Packaging Holding Company</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>388689101</cusip>
       <value>20370</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1612821</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1151045</Sole>
           <Shared>0</Shared>
           <None>461776</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Green Dot Corporation Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>39304D102</cusip>
       <value>15199</value>
       <shrsOrPrnAmt>
           <sshPrnamt>250595</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>143661</Sole>
           <Shared>0</Shared>
           <None>106934</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Greenhill &amp; Co. Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>395259104</cusip>
       <value>10638</value>
       <shrsOrPrnAmt>
           <sshPrnamt>494560</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>282748</Sole>
           <Shared>0</Shared>
           <None>211812</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Guidewire Software Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>40171V100</cusip>
       <value>41916</value>
       <shrsOrPrnAmt>
           <sshPrnamt>431415</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>269753</Sole>
           <Shared>0</Shared>
           <None>161662</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Hawaiian Holdings Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>419879101</cusip>
       <value>3995</value>
       <shrsOrPrnAmt>
           <sshPrnamt>152176</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>88347</Sole>
           <Shared>0</Shared>
           <None>63829</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>HD Supply Holdings Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>40416M105</cusip>
       <value>60293</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1390845</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>927522</Sole>
           <Shared>0</Shared>
           <None>463323</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Healthcare Trust of America Inc. Class</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>42225P501</cusip>
       <value>3680</value>
       <shrsOrPrnAmt>
           <sshPrnamt>128725</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>19481</Sole>
           <Shared>0</Shared>
           <None>109244</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>HNI Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>404251100</cusip>
       <value>39136</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1078418</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>469666</Sole>
           <Shared>0</Shared>
           <None>608752</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>IBERIABANK Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>450828108</cusip>
       <value>12109</value>
       <shrsOrPrnAmt>
           <sshPrnamt>168858</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>96616</Sole>
           <Shared>0</Shared>
           <None>72242</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>IDEXX Laboratories Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>45168D104</cusip>
       <value>42808</value>
       <shrsOrPrnAmt>
           <sshPrnamt>191449</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>129497</Sole>
           <Shared>0</Shared>
           <None>61952</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Illumina Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>452327109</cusip>
       <value>41042</value>
       <shrsOrPrnAmt>
           <sshPrnamt>132100</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>91713</Sole>
           <Shared>0</Shared>
           <None>40387</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Immunomedics Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>452907108</cusip>
       <value>20859</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1085854</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>164204</Sole>
           <Shared>0</Shared>
           <None>921650</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Incyte Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>45337C102</cusip>
       <value>91419</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1062890</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>514538</Sole>
           <Shared>0</Shared>
           <None>548352</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Innophos Holdings Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>45774N108</cusip>
       <value>22858</value>
       <shrsOrPrnAmt>
           <sshPrnamt>758389</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>335852</Sole>
           <Shared>0</Shared>
           <None>422537</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Inphi Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>45772F107</cusip>
       <value>17966</value>
       <shrsOrPrnAmt>
           <sshPrnamt>410744</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>235403</Sole>
           <Shared>0</Shared>
           <None>175341</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Insight Enterprises Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>45765U103</cusip>
       <value>54028</value>
       <shrsOrPrnAmt>
           <sshPrnamt>981256</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>436778</Sole>
           <Shared>0</Shared>
           <None>544478</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Instructure Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>45781U103</cusip>
       <value>2356</value>
       <shrsOrPrnAmt>
           <sshPrnamt>50007</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>7562</Sole>
           <Shared>0</Shared>
           <None>42445</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Insulet Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>45784P101</cusip>
       <value>186256</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1958736</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1035467</Sole>
           <Shared>0</Shared>
           <None>923269</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Integrated Device Technology Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>458118106</cusip>
       <value>29649</value>
       <shrsOrPrnAmt>
           <sshPrnamt>605195</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>343183</Sole>
           <Shared>0</Shared>
           <None>262012</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Intercept Pharmaceuticals Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>45845P108</cusip>
       <value>6657</value>
       <shrsOrPrnAmt>
           <sshPrnamt>59511</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>9007</Sole>
           <Shared>0</Shared>
           <None>50504</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Interface Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>458665304</cusip>
       <value>69788</value>
       <shrsOrPrnAmt>
           <sshPrnamt>4555383</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>2434117</Sole>
           <Shared>0</Shared>
           <None>2121266</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>International Seaways Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>Y41053102</cusip>
       <value>23518</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1372122</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>519581</Sole>
           <Shared>0</Shared>
           <None>852541</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Interxion Holding N.V.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>N47279109</cusip>
       <value>74163</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1111396</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>750848</Sole>
           <Shared>0</Shared>
           <None>360548</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>IntriCon Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>46121H109</cusip>
       <value>752</value>
       <shrsOrPrnAmt>
           <sshPrnamt>30000</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>17163</Sole>
           <Shared>0</Shared>
           <None>12837</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Itron Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>465741106</cusip>
       <value>41693</value>
       <shrsOrPrnAmt>
           <sshPrnamt>893744</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>458638</Sole>
           <Shared>0</Shared>
           <None>435106</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Jabil Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>466313103</cusip>
       <value>69330</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2607374</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1283994</Sole>
           <Shared>0</Shared>
           <None>1323380</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>James River Group Holdings Ltd</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G5005R107</cusip>
       <value>58684</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1464170</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>567533</Sole>
           <Shared>0</Shared>
           <None>896637</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Jefferies Financial Group Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>47233W109</cusip>
       <value>14102</value>
       <shrsOrPrnAmt>
           <sshPrnamt>750496</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>430838</Sole>
           <Shared>0</Shared>
           <None>319658</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>JetBlue Airways Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>477143101</cusip>
       <value>95747</value>
       <shrsOrPrnAmt>
           <sshPrnamt>5852519</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>3334371</Sole>
           <Shared>0</Shared>
           <None>2518148</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Karyopharm Therapeutics Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>48576U106</cusip>
       <value>3991</value>
       <shrsOrPrnAmt>
           <sshPrnamt>683363</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>103332</Sole>
           <Shared>0</Shared>
           <None>580031</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>KBR Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>48242W106</cusip>
       <value>136700</value>
       <shrsOrPrnAmt>
           <sshPrnamt>7160799</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>4605070</Sole>
           <Shared>0</Shared>
           <None>2555729</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Kirby Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>497266106</cusip>
       <value>15110</value>
       <shrsOrPrnAmt>
           <sshPrnamt>201165</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>115166</Sole>
           <Shared>0</Shared>
           <None>85999</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Knight-Swift Transportation Holdings I</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>499049104</cusip>
       <value>94895</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2903755</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1713795</Sole>
           <Shared>0</Shared>
           <None>1189960</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Kraton Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>50077C106</cusip>
       <value>80437</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2499597</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1233595</Sole>
           <Shared>0</Shared>
           <None>1266002</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Kratos Defense &amp; Security Solutions In</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>50077B207</cusip>
       <value>1369</value>
       <shrsOrPrnAmt>
           <sshPrnamt>87591</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>50112</Sole>
           <Shared>0</Shared>
           <None>37479</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Lam Research Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>512807108</cusip>
       <value>69901</value>
       <shrsOrPrnAmt>
           <sshPrnamt>390486</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>264620</Sole>
           <Shared>0</Shared>
           <None>125866</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Lands&apos; End Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>51509F105</cusip>
       <value>17836</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1073821</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>478945</Sole>
           <Shared>0</Shared>
           <None>594876</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Lattice Semiconductor Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>518415104</cusip>
       <value>28168</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2361138</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1054321</Sole>
           <Shared>0</Shared>
           <None>1306817</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>LCI Industries</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>50189K103</cusip>
       <value>18351</value>
       <shrsOrPrnAmt>
           <sshPrnamt>238886</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>106617</Sole>
           <Shared>0</Shared>
           <None>132269</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>LGI Homes Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>50187T106</cusip>
       <value>78669</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1305921</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>676507</Sole>
           <Shared>0</Shared>
           <None>629414</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Libbey Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>529898108</cusip>
       <value>2047</value>
       <shrsOrPrnAmt>
           <sshPrnamt>720803</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>462463</Sole>
           <Shared>0</Shared>
           <None>258340</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Lions Gate Entertainment Corp Class B</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>535919500</cusip>
       <value>10919</value>
       <shrsOrPrnAmt>
           <sshPrnamt>723087</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>414031</Sole>
           <Shared>0</Shared>
           <None>309056</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Livent Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>53814L108</cusip>
       <value>5381</value>
       <shrsOrPrnAmt>
           <sshPrnamt>438153</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>66282</Sole>
           <Shared>0</Shared>
           <None>371871</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>LKQ Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>501889208</cusip>
       <value>71137</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2506588</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1663393</Sole>
           <Shared>0</Shared>
           <None>843195</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>LPL Financial Holdings Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>50212V100</cusip>
       <value>171233</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2458484</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1454277</Sole>
           <Shared>0</Shared>
           <None>1004207</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Mack-Cali Realty Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>554489104</cusip>
       <value>59420</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2676565</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1192443</Sole>
           <Shared>0</Shared>
           <None>1484122</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>MACOM Technology Solutions Holdings In</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>55405Y100</cusip>
       <value>23690</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1417741</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>811364</Sole>
           <Shared>0</Shared>
           <None>606377</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Macquarie Infrastructure Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>55608B105</cusip>
       <value>19049</value>
       <shrsOrPrnAmt>
           <sshPrnamt>462127</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>264165</Sole>
           <Shared>0</Shared>
           <None>197962</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Madrigal Pharmaceuticals Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>558868105</cusip>
       <value>10986</value>
       <shrsOrPrnAmt>
           <sshPrnamt>87703</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>13255</Sole>
           <Shared>0</Shared>
           <None>74448</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Martin Marietta Materials Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>573284106</cusip>
       <value>16416</value>
       <shrsOrPrnAmt>
           <sshPrnamt>81597</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>46723</Sole>
           <Shared>0</Shared>
           <None>34874</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Marvell Technology Group Ltd.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G5876H105</cusip>
       <value>121546</value>
       <shrsOrPrnAmt>
           <sshPrnamt>6110933</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>4183799</Sole>
           <Shared>0</Shared>
           <None>1927134</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Masimo Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>574795100</cusip>
       <value>5660</value>
       <shrsOrPrnAmt>
           <sshPrnamt>40935</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>6194</Sole>
           <Shared>0</Shared>
           <None>34741</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>MasTec Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>576323109</cusip>
       <value>53032</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1102534</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>512665</Sole>
           <Shared>0</Shared>
           <None>589869</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Maxim Integrated Products Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>57772K101</cusip>
       <value>16226</value>
       <shrsOrPrnAmt>
           <sshPrnamt>305176</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>174533</Sole>
           <Shared>0</Shared>
           <None>130643</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>MDU Resources Group Inc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>552690109</cusip>
       <value>57805</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2237915</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>998771</Sole>
           <Shared>0</Shared>
           <None>1239144</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Merit Medical Systems Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>589889104</cusip>
       <value>63012</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1019118</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>730347</Sole>
           <Shared>0</Shared>
           <None>288771</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Meritor Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>59001K100</cusip>
       <value>45148</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2218561</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>866938</Sole>
           <Shared>0</Shared>
           <None>1351623</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Mesa Air Group Inc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>590479135</cusip>
       <value>10816</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1296929</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>742992</Sole>
           <Shared>0</Shared>
           <None>553937</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Microchip Technology Incorporated</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>595017104</cusip>
       <value>79283</value>
       <shrsOrPrnAmt>
           <sshPrnamt>955674</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>646094</Sole>
           <Shared>0</Shared>
           <None>309580</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Mimecast Limited</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G14838109</cusip>
       <value>15802</value>
       <shrsOrPrnAmt>
           <sshPrnamt>333729</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>50492</Sole>
           <Shared>0</Shared>
           <None>283237</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Mirati Therapeutics Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>60468T105</cusip>
       <value>3153</value>
       <shrsOrPrnAmt>
           <sshPrnamt>43020</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>6500</Sole>
           <Shared>0</Shared>
           <None>36520</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>MKS Instruments Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>55306N104</cusip>
       <value>6707</value>
       <shrsOrPrnAmt>
           <sshPrnamt>72079</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>10907</Sole>
           <Shared>0</Shared>
           <None>61172</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Model N Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>607525102</cusip>
       <value>17853</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1017873</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>310091</Sole>
           <Shared>0</Shared>
           <None>707782</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Modine Manufacturing Company</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>607828100</cusip>
       <value>57858</value>
       <shrsOrPrnAmt>
           <sshPrnamt>4171467</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1933296</Sole>
           <Shared>0</Shared>
           <None>2238171</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Monolithic Power Systems Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>609839105</cusip>
       <value>114508</value>
       <shrsOrPrnAmt>
           <sshPrnamt>845142</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>501649</Sole>
           <Shared>0</Shared>
           <None>343493</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Moody&apos;s Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>615369105</cusip>
       <value>66305</value>
       <shrsOrPrnAmt>
           <sshPrnamt>366144</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>241460</Sole>
           <Shared>0</Shared>
           <None>124684</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>MRC Global Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>55345K103</cusip>
       <value>45685</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2613539</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1212808</Sole>
           <Shared>0</Shared>
           <None>1400731</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Myriad Genetics Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>62855J104</cusip>
       <value>111684</value>
       <shrsOrPrnAmt>
           <sshPrnamt>3363970</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1186736</Sole>
           <Shared>0</Shared>
           <None>2177234</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Nasdaq Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>631103108</cusip>
       <value>80907</value>
       <shrsOrPrnAmt>
           <sshPrnamt>924761</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>615777</Sole>
           <Shared>0</Shared>
           <None>308984</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>National Retail Properties Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>637417106</cusip>
       <value>649</value>
       <shrsOrPrnAmt>
           <sshPrnamt>11709</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1768</Sole>
           <Shared>0</Shared>
           <None>9941</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Navigator Holdings Ltd.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>Y62132108</cusip>
       <value>13210</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1200912</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>689669</Sole>
           <Shared>0</Shared>
           <None>511243</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Nektar Therapeutics</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>640268108</cusip>
       <value>27833</value>
       <shrsOrPrnAmt>
           <sshPrnamt>828350</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>420778</Sole>
           <Shared>0</Shared>
           <None>407572</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Neurocrine Biosciences Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>64125C109</cusip>
       <value>16592</value>
       <shrsOrPrnAmt>
           <sshPrnamt>188328</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>120358</Sole>
           <Shared>0</Shared>
           <None>67970</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Neuronetics Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>64131A105</cusip>
       <value>1015</value>
       <shrsOrPrnAmt>
           <sshPrnamt>66554</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>38211</Sole>
           <Shared>0</Shared>
           <None>28343</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Nevro Corp.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>64157F103</cusip>
       <value>4211</value>
       <shrsOrPrnAmt>
           <sshPrnamt>67364</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>10192</Sole>
           <Shared>0</Shared>
           <None>57172</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>New Relic Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>64829B100</cusip>
       <value>5950</value>
       <shrsOrPrnAmt>
           <sshPrnamt>60285</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>9104</Sole>
           <Shared>0</Shared>
           <None>51181</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Noble Corporation plc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G65431101</cusip>
       <value>5143</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1791851</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1026450</Sole>
           <Shared>0</Shared>
           <None>765401</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Noble Energy Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>655044105</cusip>
       <value>46274</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1871156</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1261675</Sole>
           <Shared>0</Shared>
           <None>609481</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Novocure Ltd.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G6674U108</cusip>
       <value>17631</value>
       <shrsOrPrnAmt>
           <sshPrnamt>366010</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>55412</Sole>
           <Shared>0</Shared>
           <None>310598</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Nuance Communications Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>67020Y100</cusip>
       <value>26345</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1556092</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>890989</Sole>
           <Shared>0</Shared>
           <None>665103</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Nutanix Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>67059N108</cusip>
       <value>99380</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2633279</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1682999</Sole>
           <Shared>0</Shared>
           <None>950280</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>O&apos;Reilly Automotive Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>67103H107</cusip>
       <value>127863</value>
       <shrsOrPrnAmt>
           <sshPrnamt>329289</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>222698</Sole>
           <Shared>0</Shared>
           <None>106591</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Okta Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>679295105</cusip>
       <value>1927</value>
       <shrsOrPrnAmt>
           <sshPrnamt>23289</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>3520</Sole>
           <Shared>0</Shared>
           <None>19769</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>PAASCVR</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>697900132</cusip>
       <value>0</value>
       <shrsOrPrnAmt>
           <sshPrnamt>14267484</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>8438113</Sole>
           <Shared>0</Shared>
           <None>5829371</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Pacific Biosciences of California Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>69404D108</cusip>
       <value>7067</value>
       <shrsOrPrnAmt>
           <sshPrnamt>977464</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>534555</Sole>
           <Shared>0</Shared>
           <None>442909</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Pacira Biosciences Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>695127100</cusip>
       <value>52509</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1379625</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>539727</Sole>
           <Shared>0</Shared>
           <None>839898</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Palo Alto Networks Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>697435105</cusip>
       <value>60063</value>
       <shrsOrPrnAmt>
           <sshPrnamt>247293</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>180229</Sole>
           <Shared>0</Shared>
           <None>67064</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Pan American Silver Corp.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>697900108</cusip>
       <value>35232</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2659018</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1534983</Sole>
           <Shared>0</Shared>
           <None>1124035</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>PDC Energy Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>69327R101</cusip>
       <value>70611</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1735767</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>762755</Sole>
           <Shared>0</Shared>
           <None>973012</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Pivotal Software Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>72582H107</cusip>
       <value>3725</value>
       <shrsOrPrnAmt>
           <sshPrnamt>178659</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>27035</Sole>
           <Shared>0</Shared>
           <None>151624</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Planet Fitness Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>72703H101</cusip>
       <value>27637</value>
       <shrsOrPrnAmt>
           <sshPrnamt>402172</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>157534</Sole>
           <Shared>0</Shared>
           <None>244638</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Popular Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>733174700</cusip>
       <value>102841</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1972780</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>934179</Sole>
           <Shared>0</Shared>
           <None>1038601</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Portland General Electric Company</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>736508847</cusip>
       <value>82300</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1587580</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>688756</Sole>
           <Shared>0</Shared>
           <None>898824</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>PRA Group Inc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>69354N106</cusip>
       <value>11567</value>
       <shrsOrPrnAmt>
           <sshPrnamt>431454</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>247659</Sole>
           <Shared>0</Shared>
           <None>183795</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>PRA Health Sciences Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>69354M108</cusip>
       <value>98922</value>
       <shrsOrPrnAmt>
           <sshPrnamt>896923</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>606861</Sole>
           <Shared>0</Shared>
           <None>290062</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>PTC Therapeutics Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>69366J200</cusip>
       <value>13934</value>
       <shrsOrPrnAmt>
           <sshPrnamt>370183</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>56000</Sole>
           <Shared>0</Shared>
           <None>314183</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Pure Storage Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>74624M102</cusip>
       <value>12914</value>
       <shrsOrPrnAmt>
           <sshPrnamt>592644</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>89723</Sole>
           <Shared>0</Shared>
           <None>502921</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>QIAGEN NV</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>N72482123</cusip>
       <value>104759</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2575203</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1672222</Sole>
           <Shared>0</Shared>
           <None>902981</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Qorvo Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>74736K101</cusip>
       <value>43118</value>
       <shrsOrPrnAmt>
           <sshPrnamt>601111</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>344029</Sole>
           <Shared>0</Shared>
           <None>257082</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>QuickLogic Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>74837P108</cusip>
       <value>375</value>
       <shrsOrPrnAmt>
           <sshPrnamt>614737</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>361717</Sole>
           <Shared>0</Shared>
           <None>253020</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Raymond James Financial Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>754730109</cusip>
       <value>102678</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1276928</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>829033</Sole>
           <Shared>0</Shared>
           <None>447895</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>RealPage Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>75606N109</cusip>
       <value>30104</value>
       <shrsOrPrnAmt>
           <sshPrnamt>496022</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>75216</Sole>
           <Shared>0</Shared>
           <None>420806</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Renasant Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>75970E107</cusip>
       <value>48714</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1439126</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>642280</Sole>
           <Shared>0</Shared>
           <None>796846</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Rockwell Automation Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>773903109</cusip>
       <value>51350</value>
       <shrsOrPrnAmt>
           <sshPrnamt>292658</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>198915</Sole>
           <Shared>0</Shared>
           <None>93743</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Rogers Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>775133101</cusip>
       <value>52639</value>
       <shrsOrPrnAmt>
           <sshPrnamt>331316</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>167902</Sole>
           <Shared>0</Shared>
           <None>163414</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Roper Technologies Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>776696106</cusip>
       <value>64498</value>
       <shrsOrPrnAmt>
           <sshPrnamt>188608</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>126617</Sole>
           <Shared>0</Shared>
           <None>61991</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Ross Stores Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>778296103</cusip>
       <value>81807</value>
       <shrsOrPrnAmt>
           <sshPrnamt>878697</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>598207</Sole>
           <Shared>0</Shared>
           <None>280490</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>RPT Realty</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>74971D101</cusip>
       <value>41994</value>
       <shrsOrPrnAmt>
           <sshPrnamt>3496560</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1557543</Sole>
           <Shared>0</Shared>
           <None>1939017</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>SAGE Therapeutics Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>78667J108</cusip>
       <value>41174</value>
       <shrsOrPrnAmt>
           <sshPrnamt>258877</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>149307</Sole>
           <Shared>0</Shared>
           <None>109570</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Saia Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>78709Y105</cusip>
       <value>30231</value>
       <shrsOrPrnAmt>
           <sshPrnamt>494773</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>220361</Sole>
           <Shared>0</Shared>
           <None>274412</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Sangamo Therapeutics Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>800677106</cusip>
       <value>3962</value>
       <shrsOrPrnAmt>
           <sshPrnamt>415256</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>237796</Sole>
           <Shared>0</Shared>
           <None>177460</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>SBA Communications Corp. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>78410G104</cusip>
       <value>84862</value>
       <shrsOrPrnAmt>
           <sshPrnamt>425032</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>286390</Sole>
           <Shared>0</Shared>
           <None>138642</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Seattle Genetics Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>812578102</cusip>
       <value>92147</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1258153</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>739848</Sole>
           <Shared>0</Shared>
           <None>518305</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Semtech Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>816850101</cusip>
       <value>127760</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2509519</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1406477</Sole>
           <Shared>0</Shared>
           <None>1103042</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>ServiceNow Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>81762P102</cusip>
       <value>127956</value>
       <shrsOrPrnAmt>
           <sshPrnamt>519113</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>351327</Sole>
           <Shared>0</Shared>
           <None>167786</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Sherwin-Williams Company</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>824348106</cusip>
       <value>106383</value>
       <shrsOrPrnAmt>
           <sshPrnamt>246994</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>166929</Sole>
           <Shared>0</Shared>
           <None>80065</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>ShotSpotter Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>82536T107</cusip>
       <value>1953</value>
       <shrsOrPrnAmt>
           <sshPrnamt>50592</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>7640</Sole>
           <Shared>0</Shared>
           <None>42952</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Silicon Laboratories Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>826919102</cusip>
       <value>9636</value>
       <shrsOrPrnAmt>
           <sshPrnamt>119175</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>68332</Sole>
           <Shared>0</Shared>
           <None>50843</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>SITE Centers Corp.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>82981J109</cusip>
       <value>43849</value>
       <shrsOrPrnAmt>
           <sshPrnamt>3219451</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1226632</Sole>
           <Shared>0</Shared>
           <None>1992819</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>SM Energy Company</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>78454L100</cusip>
       <value>51049</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2918740</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1208644</Sole>
           <Shared>0</Shared>
           <None>1710096</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Splunk Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>848637104</cusip>
       <value>65393</value>
       <shrsOrPrnAmt>
           <sshPrnamt>524824</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>354533</Sole>
           <Shared>0</Shared>
           <None>170291</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>SS&amp;C Technologies Holdings Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>78467J100</cusip>
       <value>231589</value>
       <shrsOrPrnAmt>
           <sshPrnamt>3636198</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>2434196</Sole>
           <Shared>0</Shared>
           <None>1202002</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>STAG Industrial Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>85254J102</cusip>
       <value>72816</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2455856</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1046651</Sole>
           <Shared>0</Shared>
           <None>1409205</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Steelcase Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>858155203</cusip>
       <value>18688</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1284415</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>573084</Sole>
           <Shared>0</Shared>
           <None>711331</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>STERIS Plc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G8473T100</cusip>
       <value>135180</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1055850</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>720724</Sole>
           <Shared>0</Shared>
           <None>335126</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Stoneridge Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>86183P102</cusip>
       <value>5452</value>
       <shrsOrPrnAmt>
           <sshPrnamt>188928</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>42711</Sole>
           <Shared>0</Shared>
           <None>146217</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Strategic Education Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>86272C103</cusip>
       <value>2167</value>
       <shrsOrPrnAmt>
           <sshPrnamt>16500</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>2493</Sole>
           <Shared>0</Shared>
           <None>14007</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Sunstone Hotel Investors Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>867892101</cusip>
       <value>60759</value>
       <shrsOrPrnAmt>
           <sshPrnamt>4219392</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1928137</Sole>
           <Shared>0</Shared>
           <None>2291255</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>SYNNEX Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>87162W100</cusip>
       <value>4647</value>
       <shrsOrPrnAmt>
           <sshPrnamt>48720</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>7368</Sole>
           <Shared>0</Shared>
           <None>41352</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Tableau Software Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>87336U105</cusip>
       <value>68259</value>
       <shrsOrPrnAmt>
           <sshPrnamt>536291</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>346895</Sole>
           <Shared>0</Shared>
           <None>189396</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Tailored Brands Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>87403A107</cusip>
       <value>11552</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1473436</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>639148</Sole>
           <Shared>0</Shared>
           <None>834288</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Tandem Diabetes Care Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>875372203</cusip>
       <value>55342</value>
       <shrsOrPrnAmt>
           <sshPrnamt>871521</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>498868</Sole>
           <Shared>0</Shared>
           <None>372653</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>TechnipFMC Plc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G87110105</cusip>
       <value>10562</value>
       <shrsOrPrnAmt>
           <sshPrnamt>449080</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>257304</Sole>
           <Shared>0</Shared>
           <None>191776</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Teleflex Incorporated</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>879369106</cusip>
       <value>88180</value>
       <shrsOrPrnAmt>
           <sshPrnamt>291831</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>197301</Sole>
           <Shared>0</Shared>
           <None>94530</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Teradyne Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>880770102</cusip>
       <value>10144</value>
       <shrsOrPrnAmt>
           <sshPrnamt>254618</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>38518</Sole>
           <Shared>0</Shared>
           <None>216100</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Texas Capital Bancshares Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>88224Q107</cusip>
       <value>68328</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1251651</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>566821</Sole>
           <Shared>0</Shared>
           <None>684830</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>TherapeuticsMD Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>88338N107</cusip>
       <value>28524</value>
       <shrsOrPrnAmt>
           <sshPrnamt>5857096</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1767791</Sole>
           <Shared>0</Shared>
           <None>4089305</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>TiVo Corp.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>88870P106</cusip>
       <value>29033</value>
       <shrsOrPrnAmt>
           <sshPrnamt>3115165</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1785246</Sole>
           <Shared>0</Shared>
           <None>1329919</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Trade Desk Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>88339J105</cusip>
       <value>259</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1306</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>197</Sole>
           <Shared>0</Shared>
           <None>1109</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Transocean Ltd.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>H8817H100</cusip>
       <value>20993</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2410192</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1382388</Sole>
           <Shared>0</Shared>
           <None>1027804</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>TransUnion</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>89400J107</cusip>
       <value>6749</value>
       <shrsOrPrnAmt>
           <sshPrnamt>100979</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>15252</Sole>
           <Shared>0</Shared>
           <None>85727</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Trex Company Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>89531P105</cusip>
       <value>26690</value>
       <shrsOrPrnAmt>
           <sshPrnamt>433840</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>248613</Sole>
           <Shared>0</Shared>
           <None>185227</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Tronox Holdings Plc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>G9087Q102</cusip>
       <value>16848</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1281228</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>733180</Sole>
           <Shared>0</Shared>
           <None>548048</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Tutor Perini Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>901109108</cusip>
       <value>81964</value>
       <shrsOrPrnAmt>
           <sshPrnamt>4787624</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>2690682</Sole>
           <Shared>0</Shared>
           <None>2096942</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Ulta Beauty Inc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>90384S303</cusip>
       <value>109738</value>
       <shrsOrPrnAmt>
           <sshPrnamt>314680</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>220125</Sole>
           <Shared>0</Shared>
           <None>94555</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Ultra Clean Holdings Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>90385V107</cusip>
       <value>19458</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1879990</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>284506</Sole>
           <Shared>0</Shared>
           <None>1595484</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Under Armour Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>904311107</cusip>
       <value>30449</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1440353</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>966748</Sole>
           <Shared>0</Shared>
           <None>473605</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>United Continental Holdings Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>910047109</cusip>
       <value>85643</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1073492</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>613728</Sole>
           <Shared>0</Shared>
           <None>459764</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Unitil Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>913259107</cusip>
       <value>47890</value>
       <shrsOrPrnAmt>
           <sshPrnamt>884069</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>400165</Sole>
           <Shared>0</Shared>
           <None>483904</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Universal Display Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>91347P105</cusip>
       <value>67213</value>
       <shrsOrPrnAmt>
           <sshPrnamt>439732</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>271400</Sole>
           <Shared>0</Shared>
           <None>168332</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Universal Electronics Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>913483103</cusip>
       <value>19369</value>
       <shrsOrPrnAmt>
           <sshPrnamt>521379</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>298762</Sole>
           <Shared>0</Shared>
           <None>222617</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Veeco Instruments Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>922417100</cusip>
       <value>11013</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1015957</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>580791</Sole>
           <Shared>0</Shared>
           <None>435166</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>ViewRay Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>92672L107</cusip>
       <value>1746</value>
       <shrsOrPrnAmt>
           <sshPrnamt>236210</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>35718</Sole>
           <Shared>0</Shared>
           <None>200492</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Virtusa Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>92827P102</cusip>
       <value>56090</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1049396</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>466985</Sole>
           <Shared>0</Shared>
           <None>582411</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Vista Outdoor Inc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>928377100</cusip>
       <value>42501</value>
       <shrsOrPrnAmt>
           <sshPrnamt>5305969</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>2898815</Sole>
           <Shared>0</Shared>
           <None>2407154</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Vulcan Materials Company</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>929160109</cusip>
       <value>67904</value>
       <shrsOrPrnAmt>
           <sshPrnamt>573515</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>385222</Sole>
           <Shared>0</Shared>
           <None>188293</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>W. R. Berkley Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>084423102</cusip>
       <value>19225</value>
       <shrsOrPrnAmt>
           <sshPrnamt>226922</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>130013</Sole>
           <Shared>0</Shared>
           <None>96909</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>WABCO Holdings Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>92927K102</cusip>
       <value>9443</value>
       <shrsOrPrnAmt>
           <sshPrnamt>71630</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>41051</Sole>
           <Shared>0</Shared>
           <None>30579</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Washington Federal Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>938824109</cusip>
       <value>58218</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2015146</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>897502</Sole>
           <Shared>0</Shared>
           <None>1117644</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Waste Connections Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>94106B101</cusip>
       <value>163488</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1845448</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1259941</Sole>
           <Shared>0</Shared>
           <None>585507</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Waters Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>941848103</cusip>
       <value>82071</value>
       <shrsOrPrnAmt>
           <sshPrnamt>326052</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>220347</Sole>
           <Shared>0</Shared>
           <None>105705</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Watsco Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>942622200</cusip>
       <value>17010</value>
       <shrsOrPrnAmt>
           <sshPrnamt>118779</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>68008</Sole>
           <Shared>0</Shared>
           <None>50771</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Webster Financial Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>947890109</cusip>
       <value>102329</value>
       <shrsOrPrnAmt>
           <sshPrnamt>2019516</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1360637</Sole>
           <Shared>0</Shared>
           <None>658879</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>WellCare Health Plans Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>94946T106</cusip>
       <value>83160</value>
       <shrsOrPrnAmt>
           <sshPrnamt>308284</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>213226</Sole>
           <Shared>0</Shared>
           <None>95058</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Wesco Aircraft Holdings Inc</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>950814103</cusip>
       <value>59781</value>
       <shrsOrPrnAmt>
           <sshPrnamt>6801039</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>2648171</Sole>
           <Shared>0</Shared>
           <None>4152868</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>WESCO International Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>95082P105</cusip>
       <value>29436</value>
       <shrsOrPrnAmt>
           <sshPrnamt>555285</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>247335</Sole>
           <Shared>0</Shared>
           <None>307950</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>WEX Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>96208T104</cusip>
       <value>187397</value>
       <shrsOrPrnAmt>
           <sshPrnamt>976075</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>643858</Sole>
           <Shared>0</Shared>
           <None>332217</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Winnebago Industries Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>974637100</cusip>
       <value>406</value>
       <shrsOrPrnAmt>
           <sshPrnamt>13022</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>1969</Sole>
           <Shared>0</Shared>
           <None>11053</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Workday Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>98138H101</cusip>
       <value>118382</value>
       <shrsOrPrnAmt>
           <sshPrnamt>613856</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>414931</Sole>
           <Shared>0</Shared>
           <None>198925</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Worldpay Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>981558109</cusip>
       <value>76873</value>
       <shrsOrPrnAmt>
           <sshPrnamt>677299</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>457149</Sole>
           <Shared>0</Shared>
           <None>220150</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>WSFS Financial Corporation</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>929328102</cusip>
       <value>26390</value>
       <shrsOrPrnAmt>
           <sshPrnamt>683690</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>305051</Sole>
           <Shared>0</Shared>
           <None>378639</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Xilinx Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>983919101</cusip>
       <value>110021</value>
       <shrsOrPrnAmt>
           <sshPrnamt>867738</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>585679</Sole>
           <Shared>0</Shared>
           <None>282059</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Yum! Brands Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>988498101</cusip>
       <value>108547</value>
       <shrsOrPrnAmt>
           <sshPrnamt>1087532</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>755348</Sole>
           <Shared>0</Shared>
           <None>332184</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Zendesk Inc.</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>98936J101</cusip>
       <value>12578</value>
       <shrsOrPrnAmt>
           <sshPrnamt>147977</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>22392</Sole>
           <Shared>0</Shared>
           <None>125585</None>
       </votingAuthority>
   </infoTable>
   <infoTable>
       <nameOfIssuer>Zuora Inc. Class A</nameOfIssuer>
       <titleOfClass>COM</titleOfClass>
       <cusip>98983V106</cusip>
       <value>9555</value>
       <shrsOrPrnAmt>
           <sshPrnamt>477034</sshPrnamt>
           <sshPrnamtType>SH</sshPrnamtType>
       </shrsOrPrnAmt>
       <investmentDiscretion>SOLE</investmentDiscretion>
       <votingAuthority>
           <Sole>72133</Sole>
           <Shared>0</Shared>
           <None>404901</None>
       </votingAuthority>
   </infoTable>
</informationTable>
