2.4.0.80504 - Disclosure - Marketable Securities (Tables)truefalsefalse1false
falsefalseJan_01_2013_Jun_30_2013http://www.sec.gov/CIK0000043350duration2013-01-01T00:00:002013-06-30T00:00:001true
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<table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">
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<td valign="bottom" colspan="14" align="center" style="border-bottom:1px solid #000000"><font style="font-family:times new roman" size="1">June 30, 2013</font></td>
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<tr>
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<td valign="bottom" colspan="2" nowrap="nowrap" align="center" style="border-bottom:1px solid #000000"><font style="font-family:times new roman" size="1">Investment</font><br /><font style="font-family:times new roman" size="1">at cost</font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" colspan="2" nowrap="nowrap" align="center" style="border-bottom:1px solid #000000"><font style="font-family:times new roman" size="1">Unrealized<br />gains</font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" colspan="2" nowrap="nowrap" align="center" style="border-bottom:1px solid #000000"><font style="font-family:times new roman" size="1">Unrealized<br />losses</font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" colspan="2" nowrap="nowrap" align="center" style="border-bottom:1px solid #000000"><font style="font-family:times new roman" size="1">Estimated fair<br />value</font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
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<tr>
<td height="8"> </td>
<td height="8" colspan="4"> </td>
<td height="8" colspan="4"> </td>
<td height="8" colspan="4"> </td>
<td height="8" colspan="4"> </td>
</tr>
<tr bgcolor="#cceeff">
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><font style="font-family:times new roman" size="2">Common stock</font></p>
</td>
<td valign="bottom"><font size="1"> </font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:times new roman" size="2">$</font></td>
<td nowrap="nowrap" valign="bottom" align="right"><font style="font-family:times new roman" size="2"> 238,504</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:times new roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:times new roman" size="2">$</font></td>
<td nowrap="nowrap" valign="bottom" align="right"><font style="font-family:times new roman" size="2"> 115,871</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:times new roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:times new roman" size="2">$</font></td>
<td nowrap="nowrap" valign="bottom" align="right"><font style="font-family:times new roman" size="2"> —  </font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:times new roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:times new roman" size="2">$</font></td>
<td nowrap="nowrap" valign="bottom" align="right"><font style="font-family:times new roman" size="2"> 354,375</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:times new roman" size="2"> </font></td>
</tr>
<tr style="font-size:1px">
<td valign="bottom"> </td>
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</td>
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<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
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<td valign="bottom">
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</td>
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<p style="border-top:3px double #000000"> </p>
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<td> </td>
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<td valign="bottom">
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</td>
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<p style="border-top:3px double #000000"> </p>
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</table>
<p style="font-size:12px;margin-top:0px;margin-bottom:0px"> </p>
<table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">
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<tr>
<td width="60%"> </td>
<td valign="bottom" width="4%"> </td>
<td> </td>
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<td valign="bottom" colspan="14" align="center" style="border-bottom:1px solid #000000"><font style="font-family:times new roman" size="1">December 31, 2012</font></td>
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<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" colspan="2" nowrap="nowrap" align="center" style="border-bottom:1px solid #000000"><font style="font-family:times new roman" size="1">Investment<br />at cost</font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" colspan="2" nowrap="nowrap" align="center" style="border-bottom:1px solid #000000"><font style="font-family:times new roman" size="1">Unrealized<br />gains</font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" colspan="2" nowrap="nowrap" align="center" style="border-bottom:1px solid #000000"><font style="font-family:times new roman" size="1">Unrealized<br />losses</font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" colspan="2" nowrap="nowrap" align="center" style="border-bottom:1px solid #000000"><font style="font-family:times new roman" size="1">Estimated fair<br />value</font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr>
<td height="8"> </td>
<td height="8" colspan="4"> </td>
<td height="8" colspan="4"> </td>
<td height="8" colspan="4"> </td>
<td height="8" colspan="4"> </td>
</tr>
<tr bgcolor="#cceeff">
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><font style="font-family:times new roman" size="2">Common stock</font></p>
</td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="font-family:times new roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:times new roman" size="2"> 238,504</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:times new roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="font-family:times new roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:times new roman" size="2"> 105,842</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:times new roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:times new roman" size="2">$</font></td>
<td nowrap="nowrap" valign="bottom" align="right"><font style="font-family:times new roman" size="2"> —  </font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:times new roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="font-family:times new roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:times new roman" size="2"> 344,346</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:times new roman" size="2"> </font></td>
</tr>
<tr style="font-size:1px">
<td valign="bottom"> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
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</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
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</td>
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</td>
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</table>
falsefalsefalse | nonnum:textBlockItemTypenaTabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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