Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001104659-19-014846-index-headers.html | 2019-03-14 16:17:51 | |
| 0001104659-19-014846-index.html | 2019-03-14 16:17:51 | |
| 0001104659-19-014846.txt | 2019-03-14 16:17:51 | |
 0001104659-19-014846-xbrl.zip | 364840 | 2019-03-14 16:17:51 |
| a19-4259_110k.htm | 3154575 | 2019-03-14 16:17:51 |
| a19-4259_1ex10d28.htm | 154817 | 2019-03-14 16:17:51 |
| a19-4259_1ex10d29.htm | 143725 | 2019-03-14 16:17:51 |
| a19-4259_1ex21.htm | 19423 | 2019-03-14 16:17:51 |
| a19-4259_1ex23.htm | 3204 | 2019-03-14 16:17:51 |
| a19-4259_1ex31d1.htm | 12934 | 2019-03-14 16:17:51 |
| a19-4259_1ex31d2.htm | 12981 | 2019-03-14 16:17:51 |
| a19-4259_1ex32.htm | 8117 | 2019-03-14 16:17:51 |
| FilingSummary.xml | 76494 | 2019-03-14 16:17:51 |
| Financial_Report.xlsx | 174765 | 2019-03-14 16:17:51 |
 g42591bki001.jpg | 35829 | 2019-03-14 16:17:51 |
| hgr-20181231.xml | 5762528 | 2019-03-14 16:17:51 |
| hgr-20181231.xsd | 106854 | 2019-03-14 16:17:51 |
| hgr-20181231_cal.xml | 156607 | 2019-03-14 16:17:51 |
| hgr-20181231_def.xml | 394612 | 2019-03-14 16:17:51 |
| hgr-20181231_lab.xml | 981216 | 2019-03-14 16:17:51 |
| hgr-20181231_pre.xml | 806358 | 2019-03-14 16:17:51 |
| R1.htm | 33837 | 2019-03-14 16:17:51 |
| R10.htm | 58368 | 2019-03-14 16:17:51 |
| R100.htm | 27490 | 2019-03-14 16:17:51 |
| R101.htm | 66908 | 2019-03-14 16:17:51 |
| R102.htm | 6798 | 2019-03-14 16:17:51 |
| R103.htm | 11221 | 2019-03-14 16:17:51 |
| R104.htm | 34400 | 2019-03-14 16:17:51 |
| R105.htm | 24865 | 2019-03-14 16:17:51 |
| R106.htm | 42792 | 2019-03-14 16:17:51 |
| R107.htm | 7197 | 2019-03-14 16:17:51 |
| R108.htm | 12128 | 2019-03-14 16:17:51 |
| R109.htm | 9586 | 2019-03-14 16:17:51 |
| R11.htm | 302100 | 2019-03-14 16:17:51 |
| R110.htm | 28852 | 2019-03-14 16:17:51 |
| R111.htm | 54416 | 2019-03-14 16:17:51 |
| R112.htm | 34242 | 2019-03-14 16:17:51 |
| R113.htm | 54817 | 2019-03-14 16:17:51 |
| R114.htm | 13179 | 2019-03-14 16:17:51 |
| R115.htm | 4015 | 2019-03-14 16:17:51 |
| R116.htm | 14115 | 2019-03-14 16:17:51 |
| R117.htm | 21628 | 2019-03-14 16:17:51 |
| R118.htm | 16176 | 2019-03-14 16:17:51 |
| R119.htm | 51598 | 2019-03-14 16:17:51 |
| R12.htm | 21128 | 2019-03-14 16:17:51 |
| R120.htm | 61163 | 2019-03-14 16:17:51 |
| R121.htm | 39275 | 2019-03-14 16:17:51 |
| R122.htm | 20576 | 2019-03-14 16:17:51 |
| R123.htm | 16227 | 2019-03-14 16:17:51 |
| R124.htm | 72672 | 2019-03-14 16:17:51 |
| R13.htm | 52618 | 2019-03-14 16:17:51 |
| R14.htm | 30409 | 2019-03-14 16:17:51 |
| R15.htm | 192679 | 2019-03-14 16:17:51 |
| R16.htm | 62474 | 2019-03-14 16:17:51 |
| R17.htm | 65109 | 2019-03-14 16:17:51 |
| R18.htm | 243003 | 2019-03-14 16:17:51 |
| R19.htm | 94356 | 2019-03-14 16:17:51 |
| R2.htm | 71873 | 2019-03-14 16:17:51 |
| R20.htm | 33102 | 2019-03-14 16:17:51 |
| R21.htm | 93645 | 2019-03-14 16:17:51 |
| R22.htm | 10025 | 2019-03-14 16:17:51 |
| R23.htm | 31066 | 2019-03-14 16:17:51 |
| R24.htm | 160494 | 2019-03-14 16:17:51 |
| R25.htm | 18476 | 2019-03-14 16:17:51 |
| R26.htm | 9542 | 2019-03-14 16:17:51 |
| R27.htm | 272540 | 2019-03-14 16:17:51 |
| R28.htm | 92237 | 2019-03-14 16:17:51 |
| R29.htm | 29975 | 2019-03-14 16:17:51 |
| R3.htm | 13009 | 2019-03-14 16:17:51 |
| R30.htm | 5585 | 2019-03-14 16:17:51 |
| R31.htm | 287002 | 2019-03-14 16:17:51 |
| R32.htm | 335012 | 2019-03-14 16:17:51 |
| R33.htm | 189312 | 2019-03-14 16:17:51 |
| R34.htm | 57096 | 2019-03-14 16:17:51 |
| R35.htm | 300732 | 2019-03-14 16:17:51 |
| R36.htm | 21650 | 2019-03-14 16:17:51 |
| R37.htm | 52834 | 2019-03-14 16:17:51 |
| R38.htm | 28986 | 2019-03-14 16:17:51 |
| R39.htm | 184788 | 2019-03-14 16:17:51 |
| R4.htm | 54196 | 2019-03-14 16:17:51 |
| R40.htm | 61841 | 2019-03-14 16:17:51 |
| R41.htm | 63763 | 2019-03-14 16:17:51 |
| R42.htm | 246916 | 2019-03-14 16:17:51 |
| R43.htm | 95123 | 2019-03-14 16:17:51 |
| R44.htm | 31940 | 2019-03-14 16:17:51 |
| R45.htm | 86676 | 2019-03-14 16:17:51 |
| R46.htm | 32268 | 2019-03-14 16:17:51 |
| R47.htm | 155256 | 2019-03-14 16:17:51 |
| R48.htm | 267059 | 2019-03-14 16:17:51 |
| R49.htm | 91547 | 2019-03-14 16:17:51 |
| R5.htm | 21739 | 2019-03-14 16:17:51 |
| R50.htm | 30584 | 2019-03-14 16:17:51 |
| R51.htm | 286018 | 2019-03-14 16:17:51 |
| R52.htm | 15725 | 2019-03-14 16:17:51 |
| R53.htm | 40238 | 2019-03-14 16:17:51 |
| R54.htm | 36959 | 2019-03-14 16:17:51 |
| R55.htm | 48141 | 2019-03-14 16:17:51 |
| R56.htm | 24497 | 2019-03-14 16:17:51 |
| R57.htm | 4593 | 2019-03-14 16:17:51 |
| R58.htm | 4660 | 2019-03-14 16:17:51 |
| R59.htm | 6130 | 2019-03-14 16:17:51 |
| R6.htm | 6940 | 2019-03-14 16:17:51 |
| R60.htm | 19192 | 2019-03-14 16:17:51 |
| R61.htm | 14423 | 2019-03-14 16:17:51 |
| R62.htm | 13093 | 2019-03-14 16:17:51 |
| R63.htm | 6279 | 2019-03-14 16:17:51 |
| R64.htm | 17194 | 2019-03-14 16:17:51 |
| R65.htm | 5818 | 2019-03-14 16:17:51 |
| R66.htm | 13332 | 2019-03-14 16:17:51 |
| R67.htm | 4749 | 2019-03-14 16:17:51 |
| R68.htm | 34866 | 2019-03-14 16:17:51 |
| R69.htm | 11553 | 2019-03-14 16:17:51 |
| R7.htm | 59230 | 2019-03-14 16:17:51 |
| R70.htm | 37041 | 2019-03-14 16:17:51 |
| R71.htm | 26539 | 2019-03-14 16:17:51 |
| R72.htm | 8915 | 2019-03-14 16:17:51 |
| R73.htm | 22819 | 2019-03-14 16:17:51 |
| R74.htm | 54517 | 2019-03-14 16:17:51 |
| R75.htm | 12030 | 2019-03-14 16:17:51 |
| R76.htm | 37852 | 2019-03-14 16:17:51 |
| R77.htm | 35796 | 2019-03-14 16:17:51 |
| R78.htm | 41202 | 2019-03-14 16:17:51 |
| R79.htm | 49446 | 2019-03-14 16:17:51 |
| R8.htm | 111141 | 2019-03-14 16:17:51 |
| R80.htm | 17233 | 2019-03-14 16:17:51 |
| R81.htm | 25984 | 2019-03-14 16:17:51 |
| R82.htm | 12402 | 2019-03-14 16:17:51 |
| R83.htm | 21373 | 2019-03-14 16:17:51 |
| R84.htm | 18185 | 2019-03-14 16:17:51 |
| R85.htm | 27170 | 2019-03-14 16:17:51 |
| R86.htm | 34394 | 2019-03-14 16:17:51 |
| R87.htm | 54770 | 2019-03-14 16:17:51 |
| R88.htm | 10970 | 2019-03-14 16:17:51 |
| R89.htm | 10274 | 2019-03-14 16:17:51 |
| R9.htm | 268257 | 2019-03-14 16:17:51 |
| R90.htm | 20812 | 2019-03-14 16:17:51 |
| R91.htm | 4555 | 2019-03-14 16:17:51 |
| R92.htm | 6372 | 2019-03-14 16:17:51 |
| R93.htm | 15389 | 2019-03-14 16:17:51 |
| R94.htm | 8831 | 2019-03-14 16:17:51 |
| R95.htm | 16189 | 2019-03-14 16:17:51 |
| R96.htm | 7075 | 2019-03-14 16:17:51 |
| R97.htm | 17277 | 2019-03-14 16:17:51 |
| R98.htm | 7747 | 2019-03-14 16:17:51 |
| R99.htm | 41218 | 2019-03-14 16:17:51 |
| report.css | 2768 | 2019-03-14 16:17:51 |
| Show.js | 1086 | 2019-03-14 16:17:51 |