Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-15-100060-index-headers.html | 2015-03-20 15:10:55 | |
| 0001193125-15-100060-index.html | 2015-03-20 15:10:55 | |
| 0001193125-15-100060.txt | 2015-03-20 15:10:55 | |
 0001193125-15-100060-xbrl.zip | 125510 | 2015-03-20 15:10:55 |
| d845447d10k.htm | 485340 | 2015-03-20 15:10:55 |
| d845447dex23.htm | 1614 | 2015-03-20 15:10:55 |
| d845447dex311.htm | 7726 | 2015-03-20 15:10:55 |
| d845447dex312.htm | 7721 | 2015-03-20 15:10:55 |
| d845447dex32.htm | 3413 | 2015-03-20 15:10:55 |
| d845447dex321.htm | 3511 | 2015-03-20 15:10:55 |
| FilingSummary.xml | 30732 | 2015-03-20 15:10:55 |
| Financial_Report.xls | 544529 | 2015-03-20 15:10:55 |
| Financial_Report.xlsx | 137307 | 2015-03-20 15:10:55 |
| pwx-20141231.xml | 644893 | 2015-03-20 15:10:55 |
| pwx-20141231.xsd | 58071 | 2015-03-20 15:10:55 |
| pwx-20141231_cal.xml | 72577 | 2015-03-20 15:10:55 |
| pwx-20141231_def.xml | 136145 | 2015-03-20 15:10:55 |
| pwx-20141231_lab.xml | 420376 | 2015-03-20 15:10:55 |
| pwx-20141231_pre.xml | 281562 | 2015-03-20 15:10:55 |
| R1.htm | 40449 | 2015-03-20 15:10:55 |
| R10.htm | 47355 | 2015-03-20 15:10:55 |
| R11.htm | 9285 | 2015-03-20 15:10:55 |
| R12.htm | 7913 | 2015-03-20 15:10:55 |
| R13.htm | 12561 | 2015-03-20 15:10:55 |
| R14.htm | 10465 | 2015-03-20 15:10:55 |
| R15.htm | 6401 | 2015-03-20 15:10:55 |
| R16.htm | 12197 | 2015-03-20 15:10:55 |
| R17.htm | 40999 | 2015-03-20 15:10:55 |
| R18.htm | 11504 | 2015-03-20 15:10:55 |
| R19.htm | 10281 | 2015-03-20 15:10:55 |
| R2.htm | 89721 | 2015-03-20 15:10:55 |
| R20.htm | 8538 | 2015-03-20 15:10:55 |
| R21.htm | 8539 | 2015-03-20 15:10:55 |
| R22.htm | 6274 | 2015-03-20 15:10:55 |
| R23.htm | 89364 | 2015-03-20 15:10:55 |
| R24.htm | 31986 | 2015-03-20 15:10:55 |
| R25.htm | 23361 | 2015-03-20 15:10:55 |
| R26.htm | 45962 | 2015-03-20 15:10:55 |
| R27.htm | 11446 | 2015-03-20 15:10:55 |
| R28.htm | 9208 | 2015-03-20 15:10:55 |
| R29.htm | 9334 | 2015-03-20 15:10:55 |
| R3.htm | 38307 | 2015-03-20 15:10:55 |
| R30.htm | 44685 | 2015-03-20 15:10:55 |
| R31.htm | 64270 | 2015-03-20 15:10:55 |
| R32.htm | 24832 | 2015-03-20 15:10:55 |
| R33.htm | 35882 | 2015-03-20 15:10:55 |
| R34.htm | 37193 | 2015-03-20 15:10:55 |
| R35.htm | 21276 | 2015-03-20 15:10:55 |
| R36.htm | 37063 | 2015-03-20 15:10:55 |
| R37.htm | 108432 | 2015-03-20 15:10:55 |
| R38.htm | 25923 | 2015-03-20 15:10:55 |
| R39.htm | 44687 | 2015-03-20 15:10:55 |
| R4.htm | 86534 | 2015-03-20 15:10:55 |
| R40.htm | 30237 | 2015-03-20 15:10:55 |
| R41.htm | 12230 | 2015-03-20 15:10:55 |
| R42.htm | 5830 | 2015-03-20 15:10:55 |
| R43.htm | 16087 | 2015-03-20 15:10:55 |
| R44.htm | 10922 | 2015-03-20 15:10:55 |
| R45.htm | 35694 | 2015-03-20 15:10:55 |
| R46.htm | 6639 | 2015-03-20 15:10:55 |
| R47.htm | 17394 | 2015-03-20 15:10:55 |
| R48.htm | 32294 | 2015-03-20 15:10:55 |
| R49.htm | 6652 | 2015-03-20 15:10:55 |
| R5.htm | 40991 | 2015-03-20 15:10:55 |
| R50.htm | 43696 | 2015-03-20 15:10:55 |
| R51.htm | 20437 | 2015-03-20 15:10:55 |
| R52.htm | 5822 | 2015-03-20 15:10:55 |
| R53.htm | 18428 | 2015-03-20 15:10:55 |
| R54.htm | 34963 | 2015-03-20 15:10:55 |
| R55.htm | 80639 | 2015-03-20 15:10:55 |
| R56.htm | 26586 | 2015-03-20 15:10:55 |
| R57.htm | 21396 | 2015-03-20 15:10:55 |
| R6.htm | 20763 | 2015-03-20 15:10:55 |
| R7.htm | 101251 | 2015-03-20 15:10:55 |
| R8.htm | 49313 | 2015-03-20 15:10:55 |
| R9.htm | 26010 | 2015-03-20 15:10:55 |
| report.css | 2740 | 2015-03-20 15:10:55 |
| Show.js | 1410 | 2015-03-20 15:10:55 |