Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000920522-18-000011-index-headers.html | 2018-02-22 16:39:47 | |
| 0000920522-18-000011-index.html | 2018-02-22 16:39:47 | |
| 0000920522-18-000011.txt | 2018-02-22 16:39:47 | |
 0000920522-18-000011-xbrl.zip | 631357 | 2018-02-22 16:39:47 |
 ess-123115x_chartx17848a03.jpg | 60326 | 2018-02-22 16:39:47 |
| ess-123117x10k.htm | 5891950 | 2018-02-22 16:39:47 |
| ess-123117xex121.htm | 184545 | 2018-02-22 16:39:47 |
| ess-123117xex211.htm | 129913 | 2018-02-22 16:39:47 |
| ess-123117xex231.htm | 3282 | 2018-02-22 16:39:47 |
| ess-123117xex232.htm | 2982 | 2018-02-22 16:39:47 |
| ess-123117xex311.htm | 13598 | 2018-02-22 16:39:47 |
| ess-123117xex312.htm | 13597 | 2018-02-22 16:39:47 |
| ess-123117xex313.htm | 13945 | 2018-02-22 16:39:47 |
| ess-123117xex314.htm | 13960 | 2018-02-22 16:39:47 |
| ess-123117xex321.htm | 6451 | 2018-02-22 16:39:47 |
| ess-123117xex322.htm | 6579 | 2018-02-22 16:39:47 |
| ess-123117xex323.htm | 7294 | 2018-02-22 16:39:47 |
| ess-123117xex324.htm | 7271 | 2018-02-22 16:39:47 |
| ess-20171231.xml | 6801224 | 2018-02-22 16:39:47 |
| ess-20171231.xsd | 152904 | 2018-02-22 16:39:47 |
| ess-20171231_cal.xml | 138929 | 2018-02-22 16:39:47 |
| ess-20171231_def.xml | 765452 | 2018-02-22 16:39:47 |
| ess-20171231_lab.xml | 1651228 | 2018-02-22 16:39:47 |
| ess-20171231_pre.xml | 924652 | 2018-02-22 16:39:47 |
| FilingSummary.xml | 39243 | 2018-02-22 16:39:47 |
| Financial_Report.xlsx | 200909 | 2018-02-22 16:39:47 |
| R1.htm | 32467 | 2018-02-22 16:39:47 |
| R10.htm | 201962 | 2018-02-22 16:39:47 |
| R11.htm | 143547 | 2018-02-22 16:39:47 |
| R12.htm | 20988 | 2018-02-22 16:39:47 |
| R13.htm | 18062 | 2018-02-22 16:39:47 |
| R14.htm | 117961 | 2018-02-22 16:39:47 |
| R15.htm | 29336 | 2018-02-22 16:39:47 |
| R16.htm | 13722 | 2018-02-22 16:39:47 |
| R17.htm | 13178 | 2018-02-22 16:39:47 |
| R18.htm | 12859 | 2018-02-22 16:39:47 |
| R19.htm | 108873 | 2018-02-22 16:39:47 |
| R2.htm | 120183 | 2018-02-22 16:39:47 |
| R20.htm | 172181 | 2018-02-22 16:39:47 |
| R21.htm | 94242 | 2018-02-22 16:39:47 |
| R22.htm | 7407 | 2018-02-22 16:39:47 |
| R23.htm | 20215 | 2018-02-22 16:39:47 |
| R24.htm | 5194 | 2018-02-22 16:39:47 |
| R25.htm | 179889 | 2018-02-22 16:39:47 |
| R26.htm | 1319275 | 2018-02-22 16:39:47 |
| R27.htm | 105532 | 2018-02-22 16:39:47 |
| R28.htm | 138763 | 2018-02-22 16:39:47 |
| R29.htm | 116778 | 2018-02-22 16:39:47 |
| R3.htm | 17928 | 2018-02-22 16:39:47 |
| R30.htm | 20383 | 2018-02-22 16:39:47 |
| R31.htm | 123522 | 2018-02-22 16:39:47 |
| R32.htm | 72162 | 2018-02-22 16:39:47 |
| R33.htm | 12529 | 2018-02-22 16:39:47 |
| R34.htm | 105750 | 2018-02-22 16:39:47 |
| R35.htm | 156922 | 2018-02-22 16:39:47 |
| R36.htm | 93513 | 2018-02-22 16:39:47 |
| R37.htm | 12482 | 2018-02-22 16:39:47 |
| R38.htm | 181947 | 2018-02-22 16:39:47 |
| R39.htm | 19963 | 2018-02-22 16:39:47 |
| R4.htm | 87357 | 2018-02-22 16:39:47 |
| R40.htm | 193796 | 2018-02-22 16:39:47 |
| R41.htm | 11345 | 2018-02-22 16:39:47 |
| R42.htm | 39362 | 2018-02-22 16:39:47 |
| R43.htm | 39961 | 2018-02-22 16:39:47 |
| R44.htm | 212154 | 2018-02-22 16:39:47 |
| R45.htm | 29997 | 2018-02-22 16:39:47 |
| R46.htm | 61829 | 2018-02-22 16:39:47 |
| R47.htm | 21953 | 2018-02-22 16:39:47 |
| R48.htm | 90440 | 2018-02-22 16:39:47 |
| R49.htm | 29151 | 2018-02-22 16:39:47 |
| R5.htm | 28809 | 2018-02-22 16:39:47 |
| R50.htm | 21469 | 2018-02-22 16:39:47 |
| R51.htm | 45831 | 2018-02-22 16:39:47 |
| R52.htm | 22432 | 2018-02-22 16:39:47 |
| R53.htm | 183652 | 2018-02-22 16:39:47 |
| R54.htm | 43881 | 2018-02-22 16:39:47 |
| R55.htm | 22440 | 2018-02-22 16:39:47 |
| R56.htm | 44618 | 2018-02-22 16:39:47 |
| R57.htm | 20759 | 2018-02-22 16:39:47 |
| R58.htm | 36016 | 2018-02-22 16:39:47 |
| R59.htm | 38626 | 2018-02-22 16:39:47 |
| R6.htm | 89762 | 2018-02-22 16:39:47 |
| R60.htm | 96962 | 2018-02-22 16:39:47 |
| R61.htm | 13911 | 2018-02-22 16:39:47 |
| R62.htm | 28560 | 2018-02-22 16:39:47 |
| R63.htm | 58198 | 2018-02-22 16:39:47 |
| R64.htm | 92591 | 2018-02-22 16:39:47 |
| R65.htm | 6398 | 2018-02-22 16:39:47 |
| R66.htm | 28988 | 2018-02-22 16:39:47 |
| R67.htm | 7083 | 2018-02-22 16:39:47 |
| R68.htm | 39666 | 2018-02-22 16:39:47 |
| R69.htm | 2657408 | 2018-02-22 16:39:47 |
| R7.htm | 109528 | 2018-02-22 16:39:47 |
| R8.htm | 163605 | 2018-02-22 16:39:47 |
| R9.htm | 9316 | 2018-02-22 16:39:47 |
| report.css | 2767 | 2018-02-22 16:39:47 |
| Show.js | 1410 | 2018-02-22 16:39:47 |