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&lt;p style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;Below is a summary of the changes in allowance for doubtful accounts for 2011, 2012 and the six months ended June&amp;#160;30, 2013 (in thousands):&lt;/font&gt;&lt;/p&gt;
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&lt;td style="FONT-FAMILY: arial;" width="12"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" width="7" align="right"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" width="82"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" width="12"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" width="7" align="right"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" width="88"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" width="12"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" width="7" align="right"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" width="63"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" width="12"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" width="7" align="right"&gt;&lt;/td&gt;
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&lt;th style="FONT-FAMILY: arial;" align="center"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;br /&gt;&lt;/th&gt;
&lt;th style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/th&gt;
&lt;th style="FONT-FAMILY: arial;" colspan="2" nowrap="nowrap" align="center"&gt;
&lt;div style="BORDER-BOTTOM: #000000 1pt solid; WIDTH: 62pt; MARGIN-BOTTOM: 0pt;"&gt;&lt;font size="2"&gt;&lt;b&gt;Balance at&lt;br /&gt;
Beginning of&lt;br /&gt;
Period &lt;!-- COMMAND=ADD_SCROPPEDRULE,62pt --&gt;&lt;/b&gt;&lt;/font&gt;&lt;/div&gt;&lt;/th&gt;
&lt;th style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/th&gt;
&lt;th style="FONT-FAMILY: arial;" colspan="2" nowrap="nowrap" align="center"&gt;
&lt;div style="BORDER-BOTTOM: #000000 1pt solid; WIDTH: 67pt; MARGIN-BOTTOM: 0pt;"&gt;&lt;font size="2"&gt;&lt;b&gt;Provision, net&lt;br /&gt;
of Recoveries &lt;!-- COMMAND=ADD_SCROPPEDRULE,67pt --&gt;&lt;/b&gt;&lt;/font&gt;&lt;/div&gt;&lt;/th&gt;
&lt;th style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/th&gt;
&lt;th style="FONT-FAMILY: arial;" colspan="2" nowrap="nowrap" align="center"&gt;
&lt;div style="BORDER-BOTTOM: #000000 1pt solid; WIDTH: 47pt; MARGIN-BOTTOM: 0pt;"&gt;&lt;font size="2"&gt;&lt;b&gt;Write-offs &lt;!-- COMMAND=ADD_SCROPPEDRULE,47pt --&gt;&lt;/b&gt;&lt;/font&gt;&lt;/div&gt;&lt;/th&gt;
&lt;th style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/th&gt;
&lt;th style="FONT-FAMILY: arial;" colspan="2" nowrap="nowrap" align="center"&gt;
&lt;div style="BORDER-BOTTOM: #000000 1pt solid; WIDTH: 51pt; MARGIN-BOTTOM: 0pt;"&gt;&lt;font size="2"&gt;&lt;b&gt;Balance at&lt;br /&gt;
End of&lt;br /&gt;
Period &lt;!-- COMMAND=ADD_SCROPPEDRULE,51pt --&gt;&lt;/b&gt;&lt;/font&gt;&lt;/div&gt;&lt;/th&gt;
&lt;th style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/th&gt;&lt;/tr&gt;
&lt;tr style="padding:0;" valign="bottom" bgcolor="#CCEEFF"&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;
&lt;p style="TEXT-INDENT: -10pt; FONT-FAMILY: arial; MARGIN-LEFT: 10pt;"&gt;&lt;font size="2"&gt;Year ended December&amp;#160;31, 2010&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;110&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;206&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;(234&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;)&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;82&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="padding:0;" valign="bottom" bgcolor="white"&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;
&lt;p style="TEXT-INDENT: -10pt; FONT-FAMILY: arial; MARGIN-LEFT: 10pt;"&gt;&lt;font size="2"&gt;Year ended December&amp;#160;31, 2011&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;82&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;321&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;(178&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;)&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;225&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="padding:0;" valign="bottom" bgcolor="#CCEEFF"&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;
&lt;p style="TEXT-INDENT: -10pt; FONT-FAMILY: arial; MARGIN-LEFT: 10pt;"&gt;&lt;font size="2"&gt;Year ended December&amp;#160;31, 2012&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;225&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;362&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;(251&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;)&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;336&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="padding:0;" valign="bottom" bgcolor="white"&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;
&lt;p style="TEXT-INDENT: -10pt; FONT-FAMILY: arial; MARGIN-LEFT: 10pt;"&gt;&lt;font size="2"&gt;Six months ended June&amp;#160;30, 2013 (unaudited)&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;336&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;274&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;(252&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;)&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;" align="right"&gt;&lt;font size="2"&gt;358&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: arial;"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt;
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&lt;/div&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Tabular disclosure of credit losses for current financing receivables (such as trade and accounts receivable), including a rollforward of the balance.  An alternative caption includes allowance for doubtful accounts.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 310

 -SubTopic 10

 -Section 50

 -Paragraph 11B

 -Subparagraph (c)

 -URI http://asc.fasb.org/extlink&amp;oid=7512638&amp;loc=SL6953423-111524



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