Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-19-041976-index-headers.html | 2019-02-15 12:35:04 | |
| 0001193125-19-041976-index.html | 2019-02-15 12:35:04 | |
| 0001193125-19-041976.txt | 2019-02-15 12:35:04 | |
 0001193125-19-041976-xbrl.zip | 405379 | 2019-02-15 12:35:04 |
 BarChart1.png | 33115 | 2019-02-15 12:35:04 |
 BarChart10.png | 31630 | 2019-02-15 12:35:04 |
 BarChart11.png | 31754 | 2019-02-15 12:35:04 |
 BarChart12.png | 30492 | 2019-02-15 12:35:04 |
 BarChart13.png | 32520 | 2019-02-15 12:35:04 |
 BarChart14.png | 32924 | 2019-02-15 12:35:04 |
 BarChart15.png | 30161 | 2019-02-15 12:35:04 |
 BarChart2.png | 22528 | 2019-02-15 12:35:04 |
 BarChart3.png | 19832 | 2019-02-15 12:35:04 |
 BarChart4.png | 26999 | 2019-02-15 12:35:04 |
 BarChart5.png | 21555 | 2019-02-15 12:35:04 |
 BarChart6.png | 30191 | 2019-02-15 12:35:04 |
 BarChart7.png | 30810 | 2019-02-15 12:35:04 |
 BarChart8.png | 30438 | 2019-02-15 12:35:04 |
 BarChart9.png | 30968 | 2019-02-15 12:35:04 |
| d849681d497.htm | 5527 | 2019-02-15 12:35:04 |
| FilingSummary.xml | 20953 | 2019-02-15 12:35:04 |
 g849681g0215070809674.jpg | 4010 | 2019-02-15 12:35:04 |
| R1.htm | 18246 | 2019-02-15 12:35:04 |
| R100.htm | 108563 | 2019-02-15 12:35:04 |
| R106.htm | 178056 | 2019-02-15 12:35:04 |
| R107.htm | 7484 | 2019-02-15 12:35:04 |
| R15.htm | 211582 | 2019-02-15 12:35:04 |
| R16.htm | 130937 | 2019-02-15 12:35:04 |
| R2.htm | 137416 | 2019-02-15 12:35:04 |
| R22.htm | 211020 | 2019-02-15 12:35:04 |
| R23.htm | 141213 | 2019-02-15 12:35:04 |
| R29.htm | 228889 | 2019-02-15 12:35:04 |
| R30.htm | 132050 | 2019-02-15 12:35:04 |
| R36.htm | 219105 | 2019-02-15 12:35:04 |
| R37.htm | 141710 | 2019-02-15 12:35:04 |
| R43.htm | 226246 | 2019-02-15 12:35:04 |
| R44.htm | 135117 | 2019-02-15 12:35:04 |
| R50.htm | 219202 | 2019-02-15 12:35:04 |
| R51.htm | 139860 | 2019-02-15 12:35:04 |
| R57.htm | 227068 | 2019-02-15 12:35:04 |
| R58.htm | 141098 | 2019-02-15 12:35:04 |
| R64.htm | 228332 | 2019-02-15 12:35:04 |
| R65.htm | 130053 | 2019-02-15 12:35:04 |
| R71.htm | 202048 | 2019-02-15 12:35:04 |
| R72.htm | 127940 | 2019-02-15 12:35:04 |
| R78.htm | 199585 | 2019-02-15 12:35:04 |
| R79.htm | 138479 | 2019-02-15 12:35:04 |
| R8.htm | 224938 | 2019-02-15 12:35:04 |
| R85.htm | 226020 | 2019-02-15 12:35:04 |
| R86.htm | 138036 | 2019-02-15 12:35:04 |
| R9.htm | 129568 | 2019-02-15 12:35:04 |
| R92.htm | 225575 | 2019-02-15 12:35:04 |
| R93.htm | 129982 | 2019-02-15 12:35:04 |
| R99.htm | 202256 | 2019-02-15 12:35:04 |
| report.css | 2767 | 2019-02-15 12:35:04 |
| Show.js | 1085 | 2019-02-15 12:35:04 |
| wft-20190131.xml | 887319 | 2019-02-15 12:35:04 |
| wft-20190131.xsd | 80113 | 2019-02-15 12:35:04 |
| wft-20190131_cal.xml | 3984 | 2019-02-15 12:35:04 |
| wft-20190131_def.xml | 2959012 | 2019-02-15 12:35:04 |
| wft-20190131_lab.xml | 231307 | 2019-02-15 12:35:04 |
| wft-20190131_pre.xml | 2321728 | 2019-02-15 12:35:04 |