2.2.0.25falsefalse10300 - Disclosure - Earnings Per Sharetruefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011
USD ($)
USD ($) / shares
$FROM_Jan01_2011_TO_Mar31_2011http://www.sec.gov/CIK0000073020duration2011-01-01T00:00:002011-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDpershareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0nwn_EarningsPerSharenwnfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse3false0us-gaap_EarningsPerShareTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:11pt;font-weight:bold;margin-left:0px;">3</font><font style="font-family:Times New Roman;font-size:11pt;font-weight:bold;">.</font><font style="font-family:Times New Roman;font-size:11pt;font-weight:bold;">       </font><font style="font-family:Times New Roman;font-size:11pt;font-weight:bold;text-decoration:underline;">Earnings Per Share</font></p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"> </font></p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:11pt;margin-left:36px;">Basic earnings per share are computed using the weighted average number of common shares outstanding during each period presented.  Diluted earnings per share are computed using the weighted average number of common shares outstanding plus the potential effects of the assumed exercise of stock options</font><font style="font-family:Times New Roman;font-size:11pt;">,</font><font style="font-family:Times New Roman;font-size:11pt;"> and</font><font style="font-family:Times New Roman;font-size:11pt;"> payment of estimated stock awards from other stock-based compensation plans that are outstanding</font><font style="font-family:Times New Roman;font-size:11pt;">,</font><font style="font-family:Times New Roman;font-size:11pt;"> at the end of each period presented.  Diluted earnings per share are calculated as follows:</font></p><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 20px"><td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"> </td><td style="width: 460px; text-align:left;border-color:#000000;min-width:460px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="5" style="width: 230px; text-align:center;border-color:#000000;min-width:230px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;TEXT-ALIGN: center;">Three Months Ended</font></td></tr><tr style="height: 20px"><td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"> </td><td style="width: 460px; text-align:left;border-color:#000000;min-width:460px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="5" style="width: 230px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:230px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;TEXT-ALIGN: center;">March 31,</font></td></tr><tr style="height: 20px"><td colspan="2" style="width: 480px; text-align:left;border-color:#000000;min-width:480px;"><font style="TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;TEXT-ALIGN: left;">Thousands, except per share amounts</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #339966;TEXT-ALIGN: center;">2011</font></td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #339966;TEXT-ALIGN: center;">2010</font></td></tr><tr style="height: 21px"><td colspan="2" style="width: 480px; text-align:left;border-color:#000000;min-width:480px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;TEXT-ALIGN: left;">Net income</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;">$</font></td><td style="width: 100px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;"> 40,773</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;">$</font></td><td style="width: 100px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;"> 43,608</font></td></tr><tr style="height: 21px"><td colspan="2" style="width: 480px; text-align:left;border-color:#000000;min-width:480px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;TEXT-ALIGN: left;">Average common shares outstanding - basic</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; border-top-style:double;border-top-width:3px;text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;"> 26,670</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; border-top-style:double;border-top-width:3px;text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;"> 26,538</font></td></tr><tr style="height: 20px"><td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"> </td><td style="width: 460px; text-align:left;border-color:#000000;min-width:460px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;TEXT-ALIGN: left;">Additional shares for stock-based compensation plans</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;"> 54</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;"> 63</font></td></tr><tr style="height: 21px"><td colspan="2" style="width: 480px; text-align:left;border-color:#000000;min-width:480px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;TEXT-ALIGN: left;">Average common shares outstanding - diluted</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;"> 26,724</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;"> 26,601</font></td></tr><tr style="height: 22px"><td colspan="2" style="width: 480px; text-align:left;border-color:#000000;min-width:480px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;TEXT-ALIGN: left;">Earnings per share of common stock - basic </font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:double;border-top-width:3px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;">$</font></td><td style="width: 100px; border-top-style:double;border-top-width:3px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;"> 1.53</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:double;border-top-width:3px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;">$</font></td><td style="width: 100px; border-top-style:double;border-top-width:3px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;"> 1.64</font></td></tr><tr style="height: 22px"><td colspan="2" style="width: 480px; text-align:left;border-color:#000000;min-width:480px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;TEXT-ALIGN: left;">Earnings per share of common stock - diluted</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:double;border-top-width:3px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;">$</font></td><td style="width: 100px; border-top-style:double;border-top-width:3px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;"> 1.53</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:double;border-top-width:3px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;">$</font></td><td style="width: 100px; border-top-style:double;border-top-width:3px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 11pt;COLOR: #000000;"> 1.64</font></td></tr></table></div><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><p style='margin-top:12pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:11pt;margin-left:36px;">For the </font><font style="font-family:Times New Roman;font-size:11pt;">three months ended March 31, 2011 </font><font style="font-family:Times New Roman;font-size:11pt;">and</font><font style="font-family:Times New Roman;font-size:11pt;"> 2010</font><font style="font-family:Times New Roman;font-size:11pt;">, </font><font style="font-family:Times New Roman;font-size:11pt;">2,150</font><font style="font-family:Times New Roman;font-size:11pt;"> and </font><font style="font-family:Times New Roman;font-size:11pt;">5,120</font><font style="font-family:Times New Roman;font-size:11pt;"> common share equivalents, respectively, were excluded from the calculation of diluted earnings per share because the effect of these a</font><font style="font-family:Times New Roman;font-size:11pt;">dditional shares on the net income</font><font style="font-family:Times New Roman;font-size:11pt;"> for both periods would have been anti-dilutive.</font></p>3.       Earnings Per Share Basic earnings per share are computed using the weighted average number of common sharesfalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis element may be used to capture the complete disclosure pertaining to an entity's earnings per share.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
falsefalse12Earnings Per ShareUnKnownUnKnownUnKnownUnKnownfalsetrue