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| 0001193125-12-137708-index.html | 2012-03-28 17:28:40 | |
| 0001193125-12-137708.txt | 2012-03-28 17:28:40 | |
 0001193125-12-137708-xbrl.zip | 73351 | 2012-03-28 17:28:40 |
| d258817d10k.htm | 1300664 | 2012-03-28 17:28:40 |
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| d258817dex41.htm | 763 | 2012-03-28 17:28:40 |
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| Financial_Report.xls | 443420 | 2012-03-28 17:28:40 |
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 g258817g46d88.jpg | 41140 | 2012-03-28 17:28:40 |
| ngsx-20111231.xml | 515473 | 2012-03-28 17:28:40 |
| ngsx-20111231.xsd | 18308 | 2012-03-28 17:28:40 |
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| R1.htm | 37330 | 2012-03-28 17:28:40 |
| R10.htm | 38203 | 2012-03-28 17:28:40 |
| R11.htm | 46614 | 2012-03-28 17:28:40 |
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| R2.htm | 127634 | 2012-03-28 17:28:40 |
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| R8.htm | 22713 | 2012-03-28 17:28:40 |
| R9.htm | 65105 | 2012-03-28 17:28:40 |
| report.css | 2721 | 2012-03-28 17:28:40 |
| Show.js | 6423 | 2012-03-28 17:28:40 |