2.2.0.7 false Stock-based Compensation 1110 - Disclosure - Stock-based Compensation true false false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Stock-based Compensation 0 nty_StockBasedCompensationDisclosureAbstract nty false na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Stock-based Compensation 1 us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock us-gaap true na duration No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 <table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td> 11. Stock-based Compensation         On December 23, 2009, the Company granted 287 stock options to directors and certain employees under the 2008 and 2000 Stock Option Plans. These stock options were granted with an exercise price of $43.88, the closing price of the Company's common stock on the date of grant. The vesting period for these options is over four years, in three equal increments on each of the second, third and fourth anniversary of the date of grant, except those granted to Harvey Kamil, President and Chief Financial Officer, the vesting of which will accelerate if he retires after the second anniversary of the date of grant. All stock options granted expire ten years from the date of grant.         The weighted average fair value per share of the options granted was $22.13. The fair value of each option award is estimated on the date of grant using a Black-Scholes-Merton option pricing model. The following weighted average assumptions were used for the options granted in December 2009: <div style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 0pt; MARGIN-LEFT: 20%; WIDTH: 60%; PADDING-TOP: 0pt; POSITION: relative">   <div align="center"> <table cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="HEIGHT: 0px"> <td style="FONT-FAMILY: times" align="left"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="7"></td> <td style="FONT-FAMILY: times" width="26"></td> <td style="FONT-FAMILY: times" width="12"></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> Risk-free rate(1)</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times" align="right">2.9</td> <td style="FONT-FAMILY: times">%</td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> Expected term(2)</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times" align="right">6.4</td> <td style="FONT-FAMILY: times"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> Expected volatility(3)</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times" align="right">48.0</td> <td style="FONT-FAMILY: times">%</td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> Expected dividend yield</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times" align="right">0.0</td> <td style="FONT-FAMILY: times">%</td></tr></table></div> </div> <div style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 0pt; MARGIN-LEFT: 20%; PADDING-TOP: 0pt; POSITION: relative; TEXT-ALIGN: left"> <hr style="COLOR: #000000" align="left" width="26%" noshade="noshade" size="1" /> <dl compact="compact"> <dt style="MARGIN-BOTTOM: -11pt; FONT-FAMILY: times">(1)</dt> <dd style="FONT-FAMILY: times">The risk-free rate is based upon the rate on a zero coupon U.S. Treasury bill, for the expected term of the option, in effect at the time of grant. </dd> <dt style="MARGIN-BOTTOM: -11pt; FONT-FAMILY: times">(2)</dt> <dd style="FONT-FAMILY: times">The expected term of the option is based on historical employee exercise behavior, the vesting terms of the respective option and a contractual life of ten years. </dd> <dt style="MARGIN-BOTTOM: -11pt; FONT-FAMILY: times">(3)</dt> <dd style="FONT-FAMILY: times">Expected volatility is primarily based on the daily historical volatility of our stock price, over a period similar to the expected term of the option. </dd></dl></div>         On December 23, 2009, the Company also granted 21 restricted stock units to directors and certain executives under the 2009 Equity Awards Plan. The closing price of the Company's common stock on the date of grant was $43.88. These restricted stock units vest over four years, in three equal increments on each of the second, third and fourth anniversary of the date of grant, except those granted to Harvey Kamil, President and Chief Financial Officer, the vesting of which will accelerate if he retires after the second anniversary of the date of grant.</td></tr></table> 11. Stock-based Compensation         On December 23, 2009, the Company granted 287 stock options to directors and false false false us-types:textBlockItemType textblock Disclosure 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. 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