2.2.0.25falsefalse0216 - Disclosure - Derivativestruefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) / shares USD ($) $Jan-01-2010_Dec-31-2010http://www.sec.gov/CIK0000780053duration2010-01-01T00:00:002010-12-31T00:00:00USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0nhp_DerivativesAbstractnhpfalsenadurationDerivatives Abstract.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDerivatives Abstract.falsefalseDerivatives [Abstract]3false0us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00  <div style="margin-left: 0%"> <div style="margin-top: 12pt; font-size: 1pt">  </div> <table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent; text-align: left"> <tr> <td width="5%"></td> <td width="95%"></td> </tr> <tr valign="top"> <td> <b><font style="font-family: 'Times New Roman', Times">16.  </font></b> </td> <td> <b><font style="font-family: 'Times New Roman', Times">Derivatives</font></b> </td> </tr> </table> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> During August 2010, we entered into six <font style="white-space: nowrap">12-month</font> forward-starting interest rate swap agreements for an aggregate notional amount of $250.0 million at a weighted average rate of 3.16%. We entered into these swap agreements in order to hedge the expected interest payments associated with fixed rate debt forecasted to be issued in 2011. The swap agreements each have an effective date of August 1, 2011 and a termination date of August 1, 2021. We expect to settle the swap agreements when the forecasted debt is issued. We assessed the effectiveness of these swap agreements as hedges at inception and on December 31, 2010 and consider these swap agreements to be highly effective cash flow hedges. The swap agreements are recorded under the caption “Other assets” on our consolidated balance sheets at their aggregate estimated fair value of $11.2 million at December 31, 2010. </div>  </div>   <div style="margin-left: 0%">  <div align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"> <b> <font style="font-family: 'Times New Roman', Times"> </font> </b> </div> <div style="margin-top: 0pt; font-size: 1pt"> </div> <div align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"> <b> <font style="font-family: 'Times New Roman', Times"> </font> </b> </div> <div align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"> <b> <font style="font-family: 'Times New Roman', Times"> </font> </b> </div>  <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> During August and September 2007, we entered into four six-month Treasury lock agreements totaling $250.0 million at a weighted average rate of 4.212%. We entered into these Treasury lock agreements in order to hedge the expected interest payments associated with a portion of our October 2007 issuance of $300.0 million of notes which mature in 2013. These Treasury lock agreements were settled in cash on October 17, 2007 for an amount equal to the present value of the difference between the locked Treasury rates and the unwind rate. We reassessed the effectiveness of these agreements at the settlement date and determined that they were highly effective cash flow hedges under ASC 815 for $250.0 million of the $300.0 million of notes as intended. The prevailing Treasury rate exceeded the rates in the Treasury lock agreements and, as a result, the counterparties to those agreements made payments to us of $1.6 million, which was recorded as other comprehensive income. The settlement amounts are being amortized over the life of the debt as a yield reduction. During 2009, we retired $30.0 million of the $300.0 million of senior notes (see Note 10). In connection with the retirement, $0.1 million of the settlement amounts was expensed and is included in the net gain of $4.6 million which is reflected on our consolidated income statements as gain on debt extinguishment. We expect to record $0.3 million of amortization during 2011. </div> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> In June 2006, we entered into two $125.0 million, two-month Treasury lock agreements in order to hedge the expected interest payments associated with a portion of our July 2006 issuance of $350.0 million of notes which mature in 2011. These Treasury lock agreements were settled in cash on July 11, 2006, concurrent with the pricing of the $350 million of notes, for an amount equal to the present value of the difference between the locked Treasury rates and the unwind rate. We reassessed the effectiveness of these agreements at the settlement date and determined that they were highly effective cash flow hedges under ASC 815 for $250.0 million of the $350.0 million of notes as intended. The prevailing Treasury rate exceeded the rates in the Treasury lock agreements and, as a result, the counterparty to those agreements made payments to us of $1.2 million, which was recorded as other comprehensive income. The settlement amounts are being amortized over the life of the debt as a yield reduction. We expect to record $0.1 million of amortization during 2011. </div> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> During January 2008, the unconsolidated joint venture we have with a state pension fund investor entered into an interest rate swap contract (see Notes 6 and 17). </div> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> The following table sets forth amounts included on our consolidated income statements related to the amortization of the Treasury lock agreements for the periods presented: </div> <div style="margin-top: 6pt; font-size: 1pt">  </div> <table border="0" width="100%" align="center" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent; text-align: left">  <tr style="font-size: 1pt" valign="bottom"> <td width="80%"> </td> <td width="2%"> </td> <td width="1%" align="right"> </td> <td width="2%" align="right"> </td> <td width="1%" align="left"> </td> <td width="3%"> </td> <td width="1%" align="right"> </td> <td width="2%" align="right"> </td> <td width="1%" align="left"> </td> <td width="3%"> </td> <td width="1%" align="right"> </td> <td width="2%" align="right"> </td> <td width="1%" align="left"> </td> </tr>   <tr style="font-size: 8pt" valign="bottom" align="center"> <td nowrap="nowrap" align="center" valign="bottom">   </td> <td>   </td> <td colspan="10" align="center" valign="bottom" style="border-bottom: 1px solid #000000"> <b>Year Ended December 31,</b> </td> <td>   </td> </tr> <tr style="font-size: 8pt" valign="bottom" align="center"> <td nowrap="nowrap" align="center" valign="bottom">   </td> <td>   </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"> <b>2010</b> </td> <td>   </td> <td>   </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"> <b>2009</b> </td> <td>   </td> <td>   </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"> <b>2008</b> </td> <td>   </td> </tr> <tr style="font-size: 8pt" valign="bottom" align="center"> <td nowrap="nowrap" align="center" valign="bottom">   </td> <td>   </td> <td colspan="10" align="center" valign="bottom"> <b>(In thousands)</b> </td> <td>   </td> </tr> <tr style="line-height: 3pt; font-size: 1pt"> <td>  </td> </tr>  <tr valign="bottom" style="background: #cceeff"> <td align="left" valign="bottom"> <div style="text-indent: -10pt; margin-left: 10pt"> 2007 Treasury lock agreements </div> </td> <td>   </td> <td nowrap="nowrap" align="left" valign="bottom"> $ </td> <td nowrap="nowrap" align="right" valign="bottom"> 263 </td> <td nowrap="nowrap" align="left" valign="bottom">   </td> <td>   </td> <td nowrap="nowrap" align="left" valign="bottom"> $ </td> <td nowrap="nowrap" align="right" valign="bottom"> 370 </td> <td nowrap="nowrap" align="left" valign="bottom">   </td> <td>   </td> <td nowrap="nowrap" align="left" valign="bottom"> $ </td> <td nowrap="nowrap" align="right" valign="bottom"> 279 </td> <td nowrap="nowrap" align="left" valign="bottom">   </td> </tr> <tr valign="bottom"> <td align="left" valign="bottom"> <div style="text-indent: -10pt; margin-left: 10pt"> 2006 Treasury lock agreements </div> </td> <td>   </td> <td nowrap="nowrap" align="left" valign="bottom">   </td> <td nowrap="nowrap" align="right" valign="bottom"> 256 </td> <td nowrap="nowrap" align="left" valign="bottom">   </td> <td>   </td> <td nowrap="nowrap" align="left" valign="bottom">   </td> <td nowrap="nowrap" align="right" valign="bottom"> 240 </td> <td nowrap="nowrap" align="left" valign="bottom">   </td> <td>   </td> <td nowrap="nowrap" align="left" valign="bottom">   </td> <td nowrap="nowrap" align="right" valign="bottom"> 232 </td> <td nowrap="nowrap" align="left" valign="bottom">   </td> </tr> <tr valign="bottom" style="font-size: 1pt"> <td>   </td> <td>   </td> <td style="border-top: 1px solid #000000">   </td> <td style="border-top: 1px solid #000000">   </td> <td>   </td> <td>   </td> <td style="border-top: 1px solid #000000">   </td> <td style="border-top: 1px solid #000000">   </td> <td>   </td> <td>   </td> <td style="border-top: 1px solid #000000">   </td> <td style="border-top: 1px solid #000000">   </td> <td>   </td> </tr> <tr valign="bottom" style="background: #cceeff"> <td nowrap="nowrap" align="left" valign="bottom">   </td> <td>   </td> <td nowrap="nowrap" align="left" valign="bottom"> $ </td> <td nowrap="nowrap" align="right" valign="bottom"> 519 </td> <td nowrap="nowrap" align="left" valign="bottom">   </td> <td>   </td> <td nowrap="nowrap" align="left" valign="bottom"> $ </td> <td nowrap="nowrap" align="right" valign="bottom"> 610 </td> <td nowrap="nowrap" align="left" valign="bottom">   </td> <td>   </td> <td nowrap="nowrap" align="left" valign="bottom"> $ </td> <td nowrap="nowrap" align="right" valign="bottom"> 511 </td> <td nowrap="nowrap" align="left" valign="bottom">   </td> </tr> <tr valign="bottom" style="font-size: 1pt"> <td>   </td> <td>   </td> <td style="border-top: 3px double #000000">   </td> <td style="border-top: 3px double #000000">   </td> <td>   </td> <td>   </td> <td style="border-top: 3px double #000000">   </td> <td style="border-top: 3px double #000000">   </td> <td>   </td> <td>   </td> <td style="border-top: 3px double #000000">   </td> <td style="border-top: 3px double #000000">   </td> <td>   </td> </tr> </table> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> </div> </div>  <!-- Begin Block Tagged NotefalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis element can be used to disclose the entity's entire derivative instruments and hedging activities disclosure as a single block of text. 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