Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000314808-19-000021-index-headers.html | 2019-02-28 09:17:01 | |
| 0000314808-19-000021-index.html | 2019-02-28 09:17:01 | |
| 0000314808-19-000021.txt | 2019-02-28 09:17:01 | |
 0000314808-19-000021-xbrl.zip | 528133 | 2019-02-28 09:17:01 |
 comparisonof5yearcumulat.jpg | 31810 | 2019-02-28 09:17:01 |
| esv-20181231.xml | 6908919 | 2019-02-28 09:17:01 |
| esv-20181231.xsd | 106393 | 2019-02-28 09:17:01 |
| esv-20181231x10k.htm | 4478528 | 2019-02-28 09:17:01 |
| esv-20181231_cal.xml | 152806 | 2019-02-28 09:17:01 |
| esv-20181231_def.xml | 631473 | 2019-02-28 09:17:01 |
| esv-20181231_lab.xml | 1206967 | 2019-02-28 09:17:01 |
| esv-20181231_pre.xml | 879554 | 2019-02-28 09:17:01 |
| esv-ex211x12312018.htm | 74534 | 2019-02-28 09:17:01 |
| esv-ex231x12312018.htm | 4510 | 2019-02-28 09:17:01 |
| esv-ex311x12312018.htm | 11877 | 2019-02-28 09:17:01 |
| esv-ex312x12312018.htm | 13009 | 2019-02-28 09:17:01 |
| esv-ex321x12312018.htm | 6160 | 2019-02-28 09:17:01 |
| esv-ex322x12312018.htm | 6289 | 2019-02-28 09:17:01 |
| FilingSummary.xml | 67887 | 2019-02-28 09:17:01 |
| Financial_Report.xlsx | 183589 | 2019-02-28 09:17:01 |
| R1.htm | 34019 | 2019-02-28 09:17:01 |
| R10.htm | 100619 | 2019-02-28 09:17:01 |
| R100.htm | 179199 | 2019-02-28 09:17:01 |
| R101.htm | 75781 | 2019-02-28 09:17:01 |
| R11.htm | 22978 | 2019-02-28 09:17:01 |
| R12.htm | 176523 | 2019-02-28 09:17:01 |
| R13.htm | 95398 | 2019-02-28 09:17:01 |
| R14.htm | 186142 | 2019-02-28 09:17:01 |
| R15.htm | 79138 | 2019-02-28 09:17:01 |
| R16.htm | 143244 | 2019-02-28 09:17:01 |
| R17.htm | 59626 | 2019-02-28 09:17:01 |
| R18.htm | 44756 | 2019-02-28 09:17:01 |
| R19.htm | 190424 | 2019-02-28 09:17:01 |
| R2.htm | 70598 | 2019-02-28 09:17:01 |
| R20.htm | 194388 | 2019-02-28 09:17:01 |
| R21.htm | 1009999 | 2019-02-28 09:17:01 |
| R22.htm | 192863 | 2019-02-28 09:17:01 |
| R23.htm | 108421 | 2019-02-28 09:17:01 |
| R24.htm | 16833 | 2019-02-28 09:17:01 |
| R25.htm | 45694 | 2019-02-28 09:17:01 |
| R26.htm | 52092 | 2019-02-28 09:17:01 |
| R27.htm | 96491 | 2019-02-28 09:17:01 |
| R28.htm | 15558 | 2019-02-28 09:17:01 |
| R29.htm | 144896 | 2019-02-28 09:17:01 |
| R3.htm | 32546 | 2019-02-28 09:17:01 |
| R30.htm | 92334 | 2019-02-28 09:17:01 |
| R31.htm | 178751 | 2019-02-28 09:17:01 |
| R32.htm | 64010 | 2019-02-28 09:17:01 |
| R33.htm | 122012 | 2019-02-28 09:17:01 |
| R34.htm | 56276 | 2019-02-28 09:17:01 |
| R35.htm | 34473 | 2019-02-28 09:17:01 |
| R36.htm | 189690 | 2019-02-28 09:17:01 |
| R37.htm | 203671 | 2019-02-28 09:17:01 |
| R38.htm | 1007951 | 2019-02-28 09:17:01 |
| R39.htm | 192571 | 2019-02-28 09:17:01 |
| R4.htm | 73215 | 2019-02-28 09:17:01 |
| R40.htm | 172782 | 2019-02-28 09:17:01 |
| R41.htm | 9643 | 2019-02-28 09:17:01 |
| R42.htm | 4674 | 2019-02-28 09:17:01 |
| R43.htm | 20239 | 2019-02-28 09:17:01 |
| R44.htm | 31315 | 2019-02-28 09:17:01 |
| R45.htm | 27171 | 2019-02-28 09:17:01 |
| R46.htm | 84564 | 2019-02-28 09:17:01 |
| R47.htm | 57908 | 2019-02-28 09:17:01 |
| R48.htm | 23519 | 2019-02-28 09:17:01 |
| R49.htm | 6853 | 2019-02-28 09:17:01 |
| R5.htm | 11614 | 2019-02-28 09:17:01 |
| R50.htm | 19787 | 2019-02-28 09:17:01 |
| R51.htm | 55147 | 2019-02-28 09:17:01 |
| R52.htm | 11428 | 2019-02-28 09:17:01 |
| R53.htm | 32131 | 2019-02-28 09:17:01 |
| R54.htm | 83929 | 2019-02-28 09:17:01 |
| R55.htm | 273100 | 2019-02-28 09:17:01 |
| R56.htm | 14024 | 2019-02-28 09:17:01 |
| R57.htm | 24667 | 2019-02-28 09:17:01 |
| R58.htm | 65440 | 2019-02-28 09:17:01 |
| R59.htm | 91960 | 2019-02-28 09:17:01 |
| R6.htm | 79531 | 2019-02-28 09:17:01 |
| R60.htm | 42652 | 2019-02-28 09:17:01 |
| R61.htm | 20379 | 2019-02-28 09:17:01 |
| R62.htm | 31233 | 2019-02-28 09:17:01 |
| R63.htm | 9196 | 2019-02-28 09:17:01 |
| R64.htm | 101822 | 2019-02-28 09:17:01 |
| R65.htm | 50336 | 2019-02-28 09:17:01 |
| R66.htm | 67570 | 2019-02-28 09:17:01 |
| R67.htm | 16535 | 2019-02-28 09:17:01 |
| R68.htm | 12365 | 2019-02-28 09:17:01 |
| R69.htm | 34623 | 2019-02-28 09:17:01 |
| R7.htm | 76153 | 2019-02-28 09:17:01 |
| R70.htm | 95082 | 2019-02-28 09:17:01 |
| R71.htm | 24110 | 2019-02-28 09:17:01 |
| R72.htm | 43347 | 2019-02-28 09:17:01 |
| R73.htm | 28234 | 2019-02-28 09:17:01 |
| R74.htm | 19263 | 2019-02-28 09:17:01 |
| R75.htm | 34062 | 2019-02-28 09:17:01 |
| R76.htm | 22385 | 2019-02-28 09:17:01 |
| R77.htm | 17660 | 2019-02-28 09:17:01 |
| R78.htm | 27787 | 2019-02-28 09:17:01 |
| R79.htm | 24871 | 2019-02-28 09:17:01 |
| R8.htm | 62052 | 2019-02-28 09:17:01 |
| R80.htm | 28648 | 2019-02-28 09:17:01 |
| R81.htm | 70194 | 2019-02-28 09:17:01 |
| R82.htm | 27153 | 2019-02-28 09:17:01 |
| R83.htm | 20825 | 2019-02-28 09:17:01 |
| R84.htm | 12489 | 2019-02-28 09:17:01 |
| R85.htm | 14867 | 2019-02-28 09:17:01 |
| R86.htm | 15446 | 2019-02-28 09:17:01 |
| R87.htm | 15814 | 2019-02-28 09:17:01 |
| R88.htm | 17944 | 2019-02-28 09:17:01 |
| R89.htm | 21149 | 2019-02-28 09:17:01 |
| R9.htm | 65258 | 2019-02-28 09:17:01 |
| R90.htm | 14171 | 2019-02-28 09:17:01 |
| R91.htm | 4897 | 2019-02-28 09:17:01 |
| R92.htm | 10861 | 2019-02-28 09:17:01 |
| R93.htm | 7792 | 2019-02-28 09:17:01 |
| R94.htm | 30450 | 2019-02-28 09:17:01 |
| R95.htm | 61488 | 2019-02-28 09:17:01 |
| R96.htm | 17149 | 2019-02-28 09:17:01 |
| R97.htm | 114612 | 2019-02-28 09:17:01 |
| R98.htm | 79280 | 2019-02-28 09:17:01 |
| R99.htm | 123079 | 2019-02-28 09:17:01 |
| report.css | 2768 | 2019-02-28 09:17:01 |
| Show.js | 1086 | 2019-02-28 09:17:01 |