2.2.0.25falsefalse31200 - Disclosure - Stock-Based Compensation (Tables)truefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010
USD ($)
USD ($) / shares
$FROM_Jan01_2010_TO_Dec31_2010http://www.sec.gov/CIK0001000697duration2010-01-01T00:00:002010-12-31T00:00:00SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170EPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2true0wat_StockBasedCompensationAbstractwatfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse3false0us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;">The </font><font style="font-family:Times New Roman;font-size:10pt;">consolidated</font><font style="font-family:Times New Roman;font-size:10pt;"> statements of operations for the </font><font style="font-family:Times New Roman;font-size:10pt;">years ended</font><font style="font-family:Times New Roman;font-size:10pt;"> </font><font style="font-family:Times New Roman;font-size:10pt;">December 31, 2010, 2009</font><font style="font-family:Times New Roman;font-size:10pt;"> and </font><font style="font-family:Times New Roman;font-size:10pt;">2008</font><font style="font-family:Times New Roman;font-size:10pt;"> include the following stock-based compensation expense related to stock option awards, restricted stock, restricted stock unit awards and the employee stock purchase plan (in thousands):</font></p><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 17px"><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:center;border-color:#000000;min-width:224px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">2010</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">2009</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">2008</font></td></tr><tr style="height: 17px"><td colspan="2" style="width: 236px; text-align:left;border-color:#000000;min-width:236px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Cost of sales</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 2,483</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 2,767</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 2,980</font></td></tr><tr style="height: 17px"><td colspan="2" style="width: 236px; text-align:left;border-color:#000000;min-width:236px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Selling and administrative expenses</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 19,197</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 21,941</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 23,164</font></td></tr><tr style="height: 17px"><td colspan="2" style="width: 236px; text-align:left;border-color:#000000;min-width:236px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Research and development expenses</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 3,172</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 3,547</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 4,638</font></td></tr><tr style="height: 18px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Total stock-based compensation</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 24,852</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 28,255</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 30,782</font></td></tr></table></div>The consolidated statements of operations for the years ended December 31, 2010, 2009 and 2008 include the following stock-based compensation expense relatedfalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclosure that sets forth the allocation of share-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64
-Subparagraph b
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph g(1)
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F
falsefalse4false0wat_RelevantDataUsedToDetermineValueOfStockOptionsGrantedDuringPeriodTextBlockwatfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;">The relevant data used to determine the value of the stock options granted during </font><font style="font-family:Times New Roman;font-size:10pt;">2010</font><font style="font-family:Times New Roman;font-size:10pt;">, 2009</font><font style="font-family:Times New Roman;font-size:10pt;"> and </font><font style="font-family:Times New Roman;font-size:10pt;">2008</font><font style="font-family:Times New Roman;font-size:10pt;"> are 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: 17px"><td style="width: 272px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:272px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Options Issued and Significant Assumptions Used to Estimate Option Fair Values</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:105px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">2010</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:105px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">2009</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:105px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">2008</font></td></tr><tr style="height: 17px"><td style="width: 272px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:272px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Options issued in thousands</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">667</font></td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">608</font></td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">583</font></td></tr><tr style="height: 17px"><td style="width: 272px; text-align:left;border-color:#000000;min-width:272px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Risk-free interest rate</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">2.0%</font></td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">2.9%</font></td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">2.1%</font></td></tr><tr style="height: 17px"><td style="width: 272px; text-align:left;border-color:#000000;min-width:272px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Expected life in years</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">6</font></td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">6</font></td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">6</font></td></tr><tr style="height: 17px"><td style="width: 272px; text-align:left;border-color:#000000;min-width:272px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Expected volatility</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">0.271</font></td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">0.305</font></td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">0.557</font></td></tr><tr style="height: 17px"><td style="width: 272px; text-align:left;border-color:#000000;min-width:272px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Expected dividends</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> -</font></td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> -</font></td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> -</font></td></tr></table></div><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 34px"><td style="width: 236px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:236px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">2010</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">2009</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">2008</font></td></tr><tr style="height: 17px"><td style="width: 236px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:236px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Exercise price</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 78.21</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 58.46</font></td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 42.91</font></td></tr><tr style="height: 17px"><td style="width: 236px; text-align:left;border-color:#000000;min-width:236px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Fair value</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 23.97</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 20.65</font></td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 22.69</font></td></tr></table></div>The relevant data used to determine the value of the stock options granted during 2010, 2009 and 2008 are as follows:Options Issued and Significant AssumptionsfalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNo definition available.No authoritative reference available.falsefalse5false0wat_StockOptionsOutstandingRollForwardwatfalsenadurationDisclosure of the reconciliation of the stock options outstanding balance from the beginning of a period to the end of a...falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;">T</font><font style="font-family:Times New Roman;font-size:10pt;">he following table summarizes stock option activity for the plans </font><font style="font-family:Times New Roman;font-size:10pt;">for the </font><font style="font-family:Times New Roman;font-size:10pt;">year ended</font><font style="font-family:Times New Roman;font-size:10pt;"> </font><font style="font-family:Times New Roman;font-size:10pt;">December 31, 2010</font><font style="font-family:Times New Roman;font-size:10pt;"> </font><font style="font-family:Times New Roman;font-size:10pt;">(in thousands, except per share data):</font></p><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 42px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:105px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">Number of Shares</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="5" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">Price per Share</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">Weighted-Average Exercise Price</font></td></tr><tr style="height: 17px"><td colspan="3" style="width: 248px; text-align:left;border-color:#000000;min-width:248px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Outstanding at December 31, 2009</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">6,857</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 36px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:36px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">21.05</font></td><td style="width: 21px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:21px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">to</font></td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 36px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:36px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">80.97</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">47.58</font></td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 236px; text-align:left;border-color:#000000;min-width:236px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Granted</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">667</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">61.63</font></td><td style="width: 21px; text-align:center;border-color:#000000;min-width:21px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">to</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">79.05</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">78.21</font></td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 236px; text-align:left;border-color:#000000;min-width:236px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Exercised</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">(1,933)</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">21.05</font></td><td style="width: 21px; text-align:center;border-color:#000000;min-width:21px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">to</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">77.94</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">50.31</font></td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 236px; text-align:left;border-color:#000000;min-width:236px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Canceled</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">(31)</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">49.31</font></td><td style="width: 21px; text-align:center;border-color:#000000;min-width:21px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">to</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">72.06</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">68.27</font></td></tr><tr style="height: 18px"><td colspan="3" style="width: 248px; text-align:left;border-color:#000000;min-width:248px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Outstanding at December 31, 2010</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">5,560</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">21.39</font></td><td style="width: 21px; text-align:center;border-color:#000000;min-width:21px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">to</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">80.97</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">50.19</font></td></tr></table></div>The following table summarizes stock option activity for the plans for the year ended December 31, 2010 (in thousands, except per sharefalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclosure of the reconciliation of the stock options outstanding balance from the beginning of a period to the end of a period. This includes the weighted-average exercise price and range of exercise prices of the shares disclosed in each line item.No authoritative reference available.falsefalse6false0us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;">The following table details the weighted-average remaining contractual life of options outstanding at December 31, 2010 by range of exercise prices (in thousands, except per share data):</font></p><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 16px"><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"> </td><td style="width: 21px; text-align:center;border-color:#000000;min-width:21px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:center;border-color:#000000;min-width:83px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:center;border-color:#000000;min-width:83px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 82px; text-align:center;border-color:#000000;min-width:82px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Remaining</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:center;border-color:#000000;min-width:83px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:center;border-color:#000000;min-width:83px;"> </td></tr><tr style="height: 16px"><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"> </td><td style="width: 21px; text-align:center;border-color:#000000;min-width:21px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:center;border-color:#000000;min-width:83px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Number</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:center;border-color:#000000;min-width:83px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Weighted-</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 82px; text-align:center;border-color:#000000;min-width:82px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Contractual</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:center;border-color:#000000;min-width:83px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Number</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:center;border-color:#000000;min-width:83px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Weighted-</font></td></tr><tr style="height: 16px"><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"> </td><td style="width: 21px; text-align:center;border-color:#000000;min-width:21px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:center;border-color:#000000;min-width:83px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">of Shares</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:center;border-color:#000000;min-width:83px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Average</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 82px; text-align:center;border-color:#000000;min-width:82px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Life of Options</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:center;border-color:#000000;min-width:83px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">of Shares</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:center;border-color:#000000;min-width:83px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Average</font></td></tr><tr style="height: 16px"><td colspan="5" style="width: 125px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:125px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Exercise Price Range</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:83px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Outstanding</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:83px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Exercise Price</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 82px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:82px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Outstanding</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:83px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Exercisable</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:83px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Exercise Price</font></td></tr><tr style="height: 17px"><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 40px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:40px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 21.05</font></td><td style="width: 21px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:21px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">to</font></td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 40px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:40px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 38.99</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 1,710</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 83px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 32.67</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 82px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:82px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 3.0</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 1,682</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 83px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 32.59</font></td></tr><tr style="height: 17px"><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 39.00</font></td><td style="width: 21px; text-align:center;border-color:#000000;min-width:21px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">to</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 59.99</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 2,667</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 83px; text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 49.02</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 82px; text-align:right;border-color:#000000;min-width:82px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 6.2</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 1,743</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 83px; text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 47.73</font></td></tr><tr style="height: 17px"><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 60.00</font></td><td style="width: 21px; text-align:center;border-color:#000000;min-width:21px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">to</font></td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 80.97</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 1,183</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 83px; text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 78.15</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 82px; text-align:right;border-color:#000000;min-width:82px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 8.5</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 312</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 83px; text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 78.09</font></td></tr><tr style="height: 18px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"> </td><td colspan="3" style="width: 73px; text-align:left;border-color:#000000;min-width:73px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Total</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 5,560</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 83px; text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 50.19</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 82px; text-align:right;border-color:#000000;min-width:82px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 5.7</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 83px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 3,737</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 83px; text-align:right;border-color:#000000;min-width:83px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"> 43.45</font></td></tr></table></div>The following table details the weighted-average remaining contractual life of options outstanding at December 31, 2010 by range of exercise prices (infalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringAll required disclosures by grouped ranges of option exercise prices, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph f
falsefalse7false0wat_RestrictedStockUnitsUnvestedRollForwardwatfalsenadurationDisclosure of the reconciliation of the restricted stock units unvested balance from the beginning of a period to the end of...falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;">The following table summarizes the unvested restricted stock unit award activity for the </font><font style="font-family:Times New Roman;font-size:10pt;">year ended</font><font style="font-family:Times New Roman;font-size:10pt;"> </font><font style="font-family:Times New Roman;font-size:10pt;">December 31, 2010</font><font style="font-family:Times New Roman;font-size:10pt;"> (in thousands, except for per share amounts):</font></p><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 38px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 365px; text-align:left;border-color:#000000;min-width:365px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:105px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">Shares</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">Weighted-Average Price</font></td></tr><tr style="height: 17px"><td colspan="2" style="width: 377px; text-align:left;border-color:#000000;min-width:377px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;">Unvested at December 31, 2009</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">783</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">45.30</font></td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 365px; text-align:left;border-color:#000000;min-width:365px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Granted</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">217</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">62.29</font></td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 365px; text-align:left;border-color:#000000;min-width:365px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Vested</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">(218)</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">46.98</font></td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 365px; text-align:left;border-color:#000000;min-width:365px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Forfeited</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">(30)</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">47.20</font></td></tr><tr style="height: 18px"><td colspan="2" style="width: 377px; text-align:left;border-color:#000000;min-width:377px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;">Unvested at December 31, 2010</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 752</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">49.64</font></td></tr></table></div>The following table summarizes the unvested restricted stock unit award activity for the year ended December 31, 2010 (in thousands, except for per sharefalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclosure of the reconciliation of the restricted stock units unvested balance from the beginning of a period to the end of a period. This includes the weighted-average price of the shares disclosed in each line item.No authoritative reference available.falsefalse16Stock-Based Compensation (Tables)UnKnownUnKnownUnKnownUnKnownfalsetrue