Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-13-080291-index-headers.html | 2013-02-27 17:06:04 | |
| 0001193125-13-080291-index.html | 2013-02-27 17:06:04 | |
| 0001193125-13-080291.txt | 2013-02-27 17:06:04 | |
 0001193125-13-080291-xbrl.zip | 89608 | 2013-02-27 17:06:04 |
| d492933d10k.htm | 569358 | 2013-02-27 17:06:04 |
| d492933dex10b.htm | 6079 | 2013-02-27 17:06:04 |
| d492933dex31a.htm | 9869 | 2013-02-27 17:06:04 |
| d492933dex31b.htm | 9876 | 2013-02-27 17:06:04 |
| d492933dex32a.htm | 4350 | 2013-02-27 17:06:04 |
| FilingSummary.xml | 19275 | 2013-02-27 17:06:04 |
| Financial_Report.xls | 389315 | 2013-02-27 17:06:04 |
| npgp-20121231.xml | 432954 | 2013-02-27 17:06:04 |
| npgp-20121231.xsd | 32281 | 2013-02-27 17:06:04 |
| npgp-20121231_cal.xml | 62516 | 2013-02-27 17:06:04 |
| npgp-20121231_def.xml | 95085 | 2013-02-27 17:06:04 |
| npgp-20121231_lab.xml | 309721 | 2013-02-27 17:06:04 |
| npgp-20121231_pre.xml | 254846 | 2013-02-27 17:06:04 |
| R1.htm | 35574 | 2013-02-27 17:06:04 |
| R10.htm | 20704 | 2013-02-27 17:06:04 |
| R11.htm | 39645 | 2013-02-27 17:06:04 |
| R12.htm | 21166 | 2013-02-27 17:06:04 |
| R13.htm | 15598 | 2013-02-27 17:06:04 |
| R14.htm | 26763 | 2013-02-27 17:06:04 |
| R15.htm | 17763 | 2013-02-27 17:06:04 |
| R16.htm | 33623 | 2013-02-27 17:06:04 |
| R17.htm | 115110 | 2013-02-27 17:06:04 |
| R18.htm | 10039 | 2013-02-27 17:06:04 |
| R19.htm | 34536 | 2013-02-27 17:06:04 |
| R2.htm | 66580 | 2013-02-27 17:06:04 |
| R20.htm | 14532 | 2013-02-27 17:06:04 |
| R21.htm | 15335 | 2013-02-27 17:06:04 |
| R22.htm | 26486 | 2013-02-27 17:06:04 |
| R23.htm | 55487 | 2013-02-27 17:06:04 |
| R24.htm | 15132 | 2013-02-27 17:06:04 |
| R25.htm | 16903 | 2013-02-27 17:06:04 |
| R26.htm | 9942 | 2013-02-27 17:06:04 |
| R27.htm | 12190 | 2013-02-27 17:06:04 |
| R28.htm | 27090 | 2013-02-27 17:06:04 |
| R29.htm | 46352 | 2013-02-27 17:06:04 |
| R3.htm | 135021 | 2013-02-27 17:06:04 |
| R30.htm | 16693 | 2013-02-27 17:06:04 |
| R31.htm | 8071 | 2013-02-27 17:06:04 |
| R32.htm | 7749 | 2013-02-27 17:06:04 |
| R33.htm | 31845 | 2013-02-27 17:06:04 |
| R34.htm | 20637 | 2013-02-27 17:06:04 |
| R35.htm | 30054 | 2013-02-27 17:06:04 |
| R4.htm | 8615 | 2013-02-27 17:06:04 |
| R5.htm | 43689 | 2013-02-27 17:06:04 |
| R6.htm | 120762 | 2013-02-27 17:06:04 |
| R7.htm | 14510 | 2013-02-27 17:06:04 |
| R8.htm | 53833 | 2013-02-27 17:06:04 |
| R9.htm | 6659 | 2013-02-27 17:06:04 |
| report.css | 2721 | 2013-02-27 17:06:04 |
| Show.js | 6423 | 2013-02-27 17:06:04 |