<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>061100 - Disclosure - Inventories</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

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</LabelSeparator><Level>2</Level><ElementName>us-gaap_InventoryDisclosureTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>verboseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="c20130101to20130630" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;div style="font-family: 'Times New Roman', Times, serif; font-size: 10pt;"&gt;&lt;div style="text-align: justify; font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt; font-weight: bold;"&gt;Note 11. Inventories&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div style="text-align: justify; font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;The inventory value in the Fiber and Data Segment and the Telecom Segment are comprised of raw materials to be consumed in capital projects and finished goods to be used in the delivery of services at the customer premise. The inventory value in the Equipment Segment is primarily comprised of finished goods in our warehouse or in transit to customer locations. The inventory level in the Equipment Segment is subject to the fluctuations in the equipment sales activity and the timing of individual customer orders and installations.&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div style="text-align: justify; font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;Inventory balances by segment are as follows:&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;table cellpadding="0" cellspacing="0" style="width: 100%; font-family: 'Times New Roman', Times, serif; font-size: 10pt;"&gt;&lt;tr&gt;&lt;td valign="bottom" style="border-bottom: #000000 2px solid; padding-bottom: 2px; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-style: italic; text-indent: -7.2pt; font-family: ''Times New Roman'', Times, serif; color: #000000; margin-left: 7.2pt; font-size: 10pt;"&gt;(Dollars in thousands)&lt;/div&gt;&lt;/td&gt;&lt;td valign="bottom" style="border-bottom: #000000 2px solid; padding-bottom: 2px; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;td colspan="2" valign="bottom" style="border-bottom: #000000 2px solid; vertical-align: bottom;"&gt;&lt;div style="text-align: center; font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;June 30, 2013&lt;/div&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="bottom" style="border-bottom: #000000 2px solid; text-align: left; padding-bottom: 2px; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;td valign="bottom" style="border-bottom: #000000 2px solid; padding-bottom: 2px; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;td colspan="2" valign="bottom" style="border-bottom: #000000 2px solid; vertical-align: bottom;"&gt;&lt;div style="text-align: center; font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;December 31, 2012&lt;/div&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="bottom" style="border-bottom: #000000 2px solid; text-align: left; padding-bottom: 2px; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="bottom" style="background-color: #cceeff; width: 76%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; text-indent: -7.2pt; font-family: ''Times New Roman'', Times, serif; color: #000000; margin-left: 7.2pt; font-size: 10pt;"&gt;Fiber and Data&lt;/div&gt;&lt;/td&gt;&lt;td valign="bottom" style="background-color: #cceeff; width: 1%; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;td valign="bottom" style="text-align: left; background-color: #cceeff; width: 1%; vertical-align: bottom;"&gt;&lt;div style="font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;$&lt;/div&gt;&lt;/td&gt;&lt;td valign="bottom" style="text-align: right; background-color: #cceeff; width: 9%; vertical-align: bottom;"&gt;&lt;div style="font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;884&lt;/div&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="bottom" style="text-align: left; background-color: #cceeff; width: 1%; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;td valign="bottom" style="background-color: #cceeff; width: 1%; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;td valign="bottom" style="text-align: left; background-color: #cceeff; width: 1%; vertical-align: bottom;"&gt;&lt;div style="font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;$&lt;/div&gt;&lt;/td&gt;&lt;td valign="bottom" style="text-align: right; background-color: #cceeff; width: 9%; vertical-align: bottom;"&gt;&lt;div style="font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;665&lt;/div&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="bottom" style="text-align: left; background-color: #cceeff; width: 1%; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="bottom" style="background-color: #ffffff; width: 76%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; text-indent: -7.2pt; font-family: ''Times New Roman'', Times, serif; color: #000000; margin-left: 7.2pt; font-size: 10pt;"&gt;Equipment&lt;/div&gt;&lt;/td&gt;&lt;td valign="bottom" style="background-color: #ffffff; width: 1%; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;td valign="bottom" style="text-align: left; background-color: #ffffff; width: 1%; vertical-align: bottom;"&gt;&lt;div style="font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;$&lt;/div&gt;&lt;/td&gt;&lt;td valign="bottom" style="text-align: right; background-color: #ffffff; width: 9%; vertical-align: bottom;"&gt;&lt;div style="font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;4,095&lt;/div&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="bottom" style="text-align: left; background-color: #ffffff; width: 1%; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;td valign="bottom" style="background-color: #ffffff; width: 1%; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;td valign="bottom" style="text-align: left; background-color: #ffffff; width: 1%; vertical-align: bottom;"&gt;&lt;div style="font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;$&lt;/div&gt;&lt;/td&gt;&lt;td valign="bottom" style="text-align: right; background-color: #ffffff; width: 9%; vertical-align: bottom;"&gt;&lt;div style="font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;6,201&lt;/div&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="bottom" style="text-align: left; background-color: #ffffff; width: 1%; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="bottom" style="background-color: #cceeff; width: 76%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; text-indent: -7.2pt; font-family: ''Times New Roman'', Times, serif; color: #000000; margin-left: 7.2pt; font-size: 10pt;"&gt;Telecom&lt;/div&gt;&lt;/td&gt;&lt;td valign="bottom" style="background-color: #cceeff; width: 1%; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;td valign="bottom" style="text-align: left; background-color: #cceeff; width: 1%; vertical-align: bottom;"&gt;&lt;div style="font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;$&lt;/div&gt;&lt;/td&gt;&lt;td valign="bottom" style="text-align: right; background-color: #cceeff; width: 9%; vertical-align: bottom;"&gt;&lt;div style="font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;1,333&lt;/div&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="bottom" style="text-align: left; background-color: #cceeff; width: 1%; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;td valign="bottom" style="background-color: #cceeff; width: 1%; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;td valign="bottom" style="text-align: left; background-color: #cceeff; width: 1%; vertical-align: bottom;"&gt;&lt;div style="font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;$&lt;/div&gt;&lt;/td&gt;&lt;td valign="bottom" style="text-align: right; background-color: #cceeff; width: 9%; vertical-align: bottom;"&gt;&lt;div style="font-family: ''Times New Roman'', Times, serif; color: #000000; font-size: 10pt;"&gt;1,513&lt;/div&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="bottom" style="text-align: left; background-color: #cceeff; width: 1%; vertical-align: bottom;"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&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>The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

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 -Publisher AICPA

 -Name Accounting Research Bulletin (ARB)

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 -Section A

 -Paragraph 9

 -Chapter 3

 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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