<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><Version>2.2.0.25</Version><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><ReportLongName>10201 - Disclosure - Cash Equivalents and Investments:</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>1/1/2011 - 3/31/2011
USD ($)

USD ($) / shares
</KeyName><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID>Duration_1_1_2011_To_3_31_2011</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000893949</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2011-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2011-03-31T00:00:00</PeriodEndDate><Segments /><Scenarios /></contextRef><UPS><UnitProperty><UnitID>Unit12</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty><UnitProperty><UnitID>Unit1</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>shares</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty><UnitProperty><UnitID>Unit13</UnitID><UnitType>Divide</UnitType><NumeratorMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></NumeratorMeasure><DenominatorMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>shares</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace></DenominatorMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Id="1" Label="3 Months Ended" /><Label Id="2" Label="Mar. 31, 2011" /></Labels></Column></Columns><Rows><Row><Id>2</Id><IsAbstractGroupTitle>true</IsAbstractGroupTitle><Level>0</Level><ElementName>md_CashEquivalentsAndInvestmentsAbstract</ElementName><ElementPrefix>md</ElementPrefix><IsBaseElement>false</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><ShortDefinition>Cash Equivalents and Investments [Abstract]</ShortDefinition><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsSubReportEnd>false</IsSubReportEnd><IsCalendarTitle>false</IsCalendarTitle><IsTuple>false</IsTuple><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole /><FootnoteIndexer /><Cells><Cell><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Other</Unit><ElementDataType>xbrli:stringItemType</ElementDataType><SimpleDataType>string</SimpleDataType><ElementDefenition>Cash Equivalents and Investments [Abstract]</ElementDefenition><IsTotalLabel>false</IsTotalLabel><IsEPS>false</IsEPS><Label>Cash Equivalents and Investments:</Label></Row><Row><Id>3</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><Level>0</Level><ElementName>md_CashEquivalentsAndInvestmentsTextBlock</ElementName><ElementPrefix>md</ElementPrefix><IsBaseElement>false</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><ShortDefinition>Cash Equivalents and Investments [Text Block]</ShortDefinition><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsSubReportEnd>false</IsSubReportEnd><IsCalendarTitle>false</IsCalendarTitle><IsTuple>false</IsTuple><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>terselabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;div&gt;

&lt;table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt;
&lt;tr&gt;&lt;td valign="top" width="4%" align="left"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&lt;b&gt;2.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="top" align="left"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&lt;b&gt;Cash Equivalents and Investments: &lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;

&lt;p style="margin-top: 6px; text-indent: 32px; margin-bottom: 0px; margin-left: 4%;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;Certain cash equivalents carried by the Company are subject to the provisions of the accounting guidance for fair value measurements. Under this guidance, the Company is required to measure the fair value of its financial assets using a three-tier fair value hierarchy. Based on this hierarchy, the Company determined the fair value of its money market funds using quoted market prices, a Level 1 or an observable input as defined under the accounting guidance. As of March&amp;nbsp;31, 2011 and December&amp;nbsp;31, 2010, the Company's cash equivalents consisted entirely of money market funds with a fair value of $9.0 million and $11.7 million, respectively. &lt;/font&gt;&lt;/p&gt;

&lt;p style="margin-top: 6px; text-indent: 32px; margin-bottom: 0px; margin-left: 4%;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;Investments consist of municipal debt securities, federal home loan securities and certificates of deposit. Investments with remaining maturities of less than one year are classified as short-term investments. Investments classified as long-term have maturities of one year to five years. &lt;/font&gt;&lt;/p&gt;

&lt;p style="margin-top: 6px; text-indent: 32px; margin-bottom: 0px; margin-left: 4%;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;The Company intends and has the ability to hold its held-to-maturity securities to maturity, and therefore carries such investments at amortized cost in accordance with the provisions of the accounting guidance for investments in debt and equity securities. Held-to-maturity securities are not subject to the requirements of the accounting guidance for fair value measurements. &lt;/font&gt;&lt;/p&gt;

&lt;p style="margin-top: 6px; margin-bottom: 0px; font-size: 1px;"&gt;&amp;nbsp;&lt;/p&gt;

&lt;p style="margin-top: 0px; text-indent: 32px; margin-bottom: 0px; margin-left: 4%;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;Investments held at March&amp;nbsp;31, 2011, and December&amp;nbsp;31, 2010, are summarized as follows (in thousands): &lt;/font&gt;&lt;/p&gt;

&lt;p style="margin-top: 0px; margin-bottom: 0px; font-size: 12px;"&gt;&amp;nbsp;&lt;/p&gt;

&lt;table border="0" cellspacing="0" cellpadding="0" width="92%" align="center"&gt;
&lt;tr&gt;&lt;td width="60%"&gt; &lt;/td&gt;
&lt;td valign="bottom" width="5%"&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td valign="bottom" width="5%"&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td valign="bottom" width="5%"&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td valign="bottom" width="5%"&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="1"&gt;&lt;b&gt;March&amp;nbsp;31, 2011&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="1"&gt;&lt;b&gt;December&amp;nbsp;31, 2010&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="1"&gt;&lt;b&gt;Short-Term&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="1"&gt;&lt;b&gt;Long-Term&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="1"&gt;&lt;b&gt;Short-Term&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" nowrap="nowrap" align="center"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="1"&gt;&lt;b&gt;Long-Term&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td height="8"&gt; &lt;/td&gt;
&lt;td height="8" colspan="4"&gt; &lt;/td&gt;
&lt;td height="8" colspan="4"&gt; &lt;/td&gt;
&lt;td height="8" colspan="4"&gt; &lt;/td&gt;
&lt;td height="8" colspan="4"&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;

&lt;p style="text-indent: -1em; margin-left: 1em;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;Municipal debt securities&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;14,178&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;16,800&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;16,901&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;11,327&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td valign="top"&gt;

&lt;p style="text-indent: -1em; margin-left: 1em;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;Federal home loan securities&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;#8212;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;16,066&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;#8212;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;16,066&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;

&lt;p style="text-indent: -1em; margin-left: 1em;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;Certificates of deposit&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;480&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;#8212;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;480&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;#8212;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 1px;"&gt;&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td valign="top"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;14,658&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;32,866&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;17,381&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;27,393&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 1px;"&gt;&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt; &lt;/div&gt;</NonNumbericText><NonNumericTextHeader>2.
Cash Equivalents and Investments:

Certain cash equivalents carried by the Company are subject to the provisions of the accounting guidance for fair value</NonNumericTextHeader><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Other</Unit><ElementDataType>us-types:textBlockItemType</ElementDataType><SimpleDataType>string</SimpleDataType><ElementDefenition>Cash Equivalents and Investments [Text Block]</ElementDefenition><ElementReferences>No authoritative reference available.</ElementReferences><IsTotalLabel>false</IsTotalLabel><IsEPS>false</IsEPS><Label>Cash Equivalents and Investments:</Label></Row></Rows><Footnotes /><NumberOfCols>1</NumberOfCols><NumberOfRows>2</NumberOfRows><ReportName>Cash Equivalents and Investments:</ReportName><MonetaryRoundingLevel>UnKnown</MonetaryRoundingLevel><SharesRoundingLevel>UnKnown</SharesRoundingLevel><PerShareRoundingLevel>UnKnown</PerShareRoundingLevel><ExchangeRateRoundingLevel>UnKnown</ExchangeRateRoundingLevel><HasCustomUnits>false</HasCustomUnits><SharesShouldBeRounded>true</SharesShouldBeRounded></InstanceReport>
