2.2.0.25falsefalse006090 - Disclosure - Stock-Based Compensationtruefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $c20110101to20110331http://www.sec.gov/CIK0000072207duration2011-01-01T00:00:002011-03-31T00:00:00U003Standardhttp://www.xbrl.org/2003/instancesharesxbrli0U001Standardhttp://www.xbrl.org/2003/iso4217USDiso42170U002Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0U004Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2true0nbl_NotesToFinancialStatementsAbstractnblfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseNotes to Financial Statements [Abstract]3false0us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00<div><div align="justify" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt; font-weight: bold;">Note 9.   Stock-Based Compensation</font></div><div style="text-indent: 0pt; display: block;"><br /></div><div align="justify" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt;">We recognized stock-based compensation expense as follows:</font></div><div style="text-indent: 0pt; display: block;"><br /></div><div><table cellpadding="0" cellspacing="0" width="100%" style="font-family: times new roman; font-size: 10pt;"><tr><td align="left" valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">  </font></td><td valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td colspan="6" nowrap="nowrap" valign="bottom" style="border-bottom: black 2px solid;"><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">Three Months Ended March 31,</font></font></div></td><td nowrap="nowrap" valign="bottom" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td></tr><tr><td align="left" valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">  </font></td><td valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td colspan="2" valign="bottom" style="border-bottom: black 2px solid;"><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">2011</font></font></div></td><td nowrap="nowrap" valign="bottom" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td colspan="2" valign="bottom" style="border-bottom: black 2px solid;"><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">2010</font></font></div></td><td nowrap="nowrap" valign="bottom" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td></tr><tr bgcolor="white"><td align="left" valign="bottom"><div align="left" style="text-indent: -9pt; display: block; margin-left: 9pt; margin-right: 0pt;"><font style="font-style: italic; display: inline; font-family: times new roman; font-size: 10pt;">(millions)</font></div></td><td align="left" valign="bottom"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td align="left" colspan="2" valign="bottom"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td nowrap="nowrap" valign="bottom" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td align="left" valign="bottom"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td align="left" colspan="2" valign="bottom"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td nowrap="nowrap" valign="bottom" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td></tr><tr bgcolor="#cceeff"><td align="left" valign="bottom" width="76%"><div align="left" style="text-indent: -9pt; display: block; margin-left: 9pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">Stock-Based Compensation Expense</font></div></td><td valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">$</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">14</font></td><td nowrap="nowrap" valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">$</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">14</font></td><td nowrap="nowrap" valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td></tr><tr bgcolor="white"><td align="left" valign="bottom" width="76%" style="border-bottom: black 2px solid;"><div align="left" style="text-indent: -9pt; display: block; margin-left: 9pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">Tax Benefit Recognized</font></font></div></td><td valign="bottom" width="1%" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="1%" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="9%" style="border-bottom: black 2px solid; text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">(5</font></font></td><td nowrap="nowrap" valign="bottom" width="1%" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">)</font></td><td valign="bottom" width="1%" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="1%" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="9%" style="border-bottom: black 2px solid; text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">(5</font></font></td><td nowrap="nowrap" valign="bottom" width="1%" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">)</font></td></tr></table></div><div> </div><div align="left" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt;">During the three months ended March 31, 2011, we granted stock options and awarded shares of restricted stock (subject to service conditions) as follows:</font></div><div style="text-indent: 0pt; display: block;"><br /></div><div align="left"><table cellpadding="0" cellspacing="0" width="100%" style="font-family: times new roman; font-size: 10pt;"><tr><td align="left" valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">  </font></td><td valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td colspan="2" valign="bottom" style="border-bottom: black 2px solid;"><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">Number Granted/Awarded</font></font></div></td><td nowrap="nowrap" valign="bottom" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td colspan="2" nowrap="nowrap" valign="bottom" style="border-bottom: black 2px solid;"><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">Weighted Average</font></font></div><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">Grant-Date</font></font></div><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">Fair Value</font></font></div></td><td nowrap="nowrap" valign="bottom" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td></tr><tr bgcolor="#cceeff"><td align="left" valign="bottom" width="76%"><div align="left" style="text-indent: -9pt; display: block; margin-left: 9pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">Stock Options</font></div></td><td align="left" valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">965,423</font></td><td nowrap="nowrap" valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td align="left" valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">$</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">30.21</font></td><td nowrap="nowrap" valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td></tr><tr bgcolor="white"><td align="left" valign="bottom" width="76%" style="border-bottom: black 2px solid;"><div align="left" style="text-indent: -9pt; display: block; margin-left: 9pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">Shares of Restricted Stock</font></font></div></td><td align="left" valign="bottom" width="1%" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="1%" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="9%" style="border-bottom: black 2px solid; text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">394,922</font></font></td><td nowrap="nowrap" valign="bottom" width="1%" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td align="left" valign="bottom" width="1%" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="1%" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">$</font></td><td valign="bottom" width="9%" style="border-bottom: black 2px solid; text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">90.37</font></td><td nowrap="nowrap" valign="bottom" width="1%" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td></tr></table></div><div style="text-indent: 0pt; display: block;"><br /></div><div align="left" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt;">On April 26, 2011, our stockholders approved the amendment and restatement of our 1992 Stock Option and Restricted Stock Plan to increase the number of shares of common stock authorized for issuance under the plan from 24 million to 31 million and modify certain plan provisions.</font></div><div style="text-indent: 0pt; display: block;"><br /></div></div>Note 9.   Stock-Based CompensationWe recognized stock-based compensation expense as follows:   Three MonthsfalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclosure of compensation-related costs for share-based compensation which may include disclosure of policies, compensation plan details, allocation of stock compensation, incentive distributions, share-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 falsefalseStock-Based Compensation12Stock-Based CompensationUnKnownUnKnownUnKnownUnKnownfalsetrue