Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000931148-14-000040-index-headers.html | 2014-02-27 16:40:00 | |
| 0000931148-14-000040-index.html | 2014-02-27 16:40:00 | |
| 0000931148-14-000040.txt | 2014-02-27 16:40:00 | |
 0000931148-14-000040-xbrl.zip | 474434 | 2014-02-27 16:40:00 |
| a201310k.htm | 3823590 | 2014-02-27 16:40:00 |
| exhibit1043longtermincenti.htm | 123724 | 2014-02-27 16:40:00 |
| exhibit1210ratioofearnings.htm | 40195 | 2014-02-27 16:40:00 |
| exhibit2110subsidiaries.htm | 68256 | 2014-02-27 16:40:00 |
| exhibit2310pwcconsent.htm | 2203 | 2014-02-27 16:40:00 |
| FilingSummary.xml | 64507 | 2014-02-27 16:40:00 |
| Financial_Report.xls | 4985459 | 2014-02-27 16:40:00 |
| Financial_Report.xlsx | 523600 | 2014-02-27 16:40:00 |
 fiveyearstockchart.jpg | 52642 | 2014-02-27 16:40:00 |
| gti-20131231.xml | 5946973 | 2014-02-27 16:40:00 |
| gti-20131231.xsd | 96780 | 2014-02-27 16:40:00 |
| gti-20131231_cal.xml | 162829 | 2014-02-27 16:40:00 |
| gti-20131231_def.xml | 607090 | 2014-02-27 16:40:00 |
| gti-20131231_lab.xml | 1180464 | 2014-02-27 16:40:00 |
| gti-20131231_pre.xml | 883020 | 2014-02-27 16:40:00 |
| gti201310kex311.htm | 10503 | 2014-02-27 16:40:00 |
| gti201310kex312.htm | 10623 | 2014-02-27 16:40:00 |
| gti201310kex321.htm | 7604 | 2014-02-27 16:40:00 |
| gti201310kex322.htm | 7319 | 2014-02-27 16:40:00 |
 logotagcolora02.jpg | 9375 | 2014-02-27 16:40:00 |
| R1.htm | 37316 | 2014-02-27 16:40:00 |
| R10.htm | 94839 | 2014-02-27 16:40:00 |
| R100.htm | 140206 | 2014-02-27 16:40:00 |
| R101.htm | 26063 | 2014-02-27 16:40:00 |
| R102.htm | 12802 | 2014-02-27 16:40:00 |
| R103.htm | 58444 | 2014-02-27 16:40:00 |
| R104.htm | 9879 | 2014-02-27 16:40:00 |
| R105.htm | 12047 | 2014-02-27 16:40:00 |
| R106.htm | 34199 | 2014-02-27 16:40:00 |
| R107.htm | 34463 | 2014-02-27 16:40:00 |
| R108.htm | 63709 | 2014-02-27 16:40:00 |
| R109.htm | 16934 | 2014-02-27 16:40:00 |
| R11.htm | 8459 | 2014-02-27 16:40:00 |
| R110.htm | 26703 | 2014-02-27 16:40:00 |
| R111.htm | 16800 | 2014-02-27 16:40:00 |
| R112.htm | 20728 | 2014-02-27 16:40:00 |
| R113.htm | 23120 | 2014-02-27 16:40:00 |
| R12.htm | 48153 | 2014-02-27 16:40:00 |
| R13.htm | 30054 | 2014-02-27 16:40:00 |
| R14.htm | 113707 | 2014-02-27 16:40:00 |
| R15.htm | 23864 | 2014-02-27 16:40:00 |
| R16.htm | 7834 | 2014-02-27 16:40:00 |
| R17.htm | 76556 | 2014-02-27 16:40:00 |
| R18.htm | 15027 | 2014-02-27 16:40:00 |
| R19.htm | 549174 | 2014-02-27 16:40:00 |
| R2.htm | 142362 | 2014-02-27 16:40:00 |
| R20.htm | 72012 | 2014-02-27 16:40:00 |
| R21.htm | 1017620 | 2014-02-27 16:40:00 |
| R22.htm | 14309 | 2014-02-27 16:40:00 |
| R23.htm | 159563 | 2014-02-27 16:40:00 |
| R24.htm | 20944 | 2014-02-27 16:40:00 |
| R25.htm | 18151 | 2014-02-27 16:40:00 |
| R26.htm | 167276 | 2014-02-27 16:40:00 |
| R27.htm | 17815 | 2014-02-27 16:40:00 |
| R28.htm | 37629 | 2014-02-27 16:40:00 |
| R29.htm | 98081 | 2014-02-27 16:40:00 |
| R3.htm | 33341 | 2014-02-27 16:40:00 |
| R30.htm | 44868 | 2014-02-27 16:40:00 |
| R31.htm | 20152 | 2014-02-27 16:40:00 |
| R32.htm | 77763 | 2014-02-27 16:40:00 |
| R33.htm | 21348 | 2014-02-27 16:40:00 |
| R34.htm | 79373 | 2014-02-27 16:40:00 |
| R35.htm | 14205 | 2014-02-27 16:40:00 |
| R36.htm | 554976 | 2014-02-27 16:40:00 |
| R37.htm | 61093 | 2014-02-27 16:40:00 |
| R38.htm | 1022521 | 2014-02-27 16:40:00 |
| R39.htm | 11134 | 2014-02-27 16:40:00 |
| R4.htm | 101084 | 2014-02-27 16:40:00 |
| R40.htm | 160612 | 2014-02-27 16:40:00 |
| R41.htm | 15897 | 2014-02-27 16:40:00 |
| R42.htm | 15623 | 2014-02-27 16:40:00 |
| R43.htm | 41139 | 2014-02-27 16:40:00 |
| R44.htm | 10963 | 2014-02-27 16:40:00 |
| R45.htm | 9964 | 2014-02-27 16:40:00 |
| R46.htm | 9450 | 2014-02-27 16:40:00 |
| R47.htm | 21941 | 2014-02-27 16:40:00 |
| R48.htm | 19719 | 2014-02-27 16:40:00 |
| R49.htm | 47890 | 2014-02-27 16:40:00 |
| R5.htm | 7294 | 2014-02-27 16:40:00 |
| R50.htm | 9206 | 2014-02-27 16:40:00 |
| R51.htm | 29571 | 2014-02-27 16:40:00 |
| R52.htm | 30736 | 2014-02-27 16:40:00 |
| R53.htm | 10476 | 2014-02-27 16:40:00 |
| R54.htm | 10738 | 2014-02-27 16:40:00 |
| R55.htm | 19384 | 2014-02-27 16:40:00 |
| R56.htm | 10363 | 2014-02-27 16:40:00 |
| R57.htm | 21054 | 2014-02-27 16:40:00 |
| R58.htm | 12652 | 2014-02-27 16:40:00 |
| R59.htm | 17560 | 2014-02-27 16:40:00 |
| R6.htm | 177687 | 2014-02-27 16:40:00 |
| R60.htm | 36601 | 2014-02-27 16:40:00 |
| R61.htm | 15165 | 2014-02-27 16:40:00 |
| R62.htm | 23358 | 2014-02-27 16:40:00 |
| R63.htm | 35132 | 2014-02-27 16:40:00 |
| R64.htm | 13867 | 2014-02-27 16:40:00 |
| R65.htm | 10493 | 2014-02-27 16:40:00 |
| R66.htm | 11397 | 2014-02-27 16:40:00 |
| R67.htm | 12807 | 2014-02-27 16:40:00 |
| R68.htm | 29883 | 2014-02-27 16:40:00 |
| R69.htm | 12734 | 2014-02-27 16:40:00 |
| R7.htm | 98793 | 2014-02-27 16:40:00 |
| R70.htm | 5046 | 2014-02-27 16:40:00 |
| R71.htm | 76044 | 2014-02-27 16:40:00 |
| R72.htm | 13354 | 2014-02-27 16:40:00 |
| R73.htm | 14286 | 2014-02-27 16:40:00 |
| R74.htm | 7002 | 2014-02-27 16:40:00 |
| R75.htm | 27198 | 2014-02-27 16:40:00 |
| R76.htm | 58631 | 2014-02-27 16:40:00 |
| R77.htm | 34231 | 2014-02-27 16:40:00 |
| R78.htm | 22983 | 2014-02-27 16:40:00 |
| R79.htm | 130020 | 2014-02-27 16:40:00 |
| R8.htm | 57829 | 2014-02-27 16:40:00 |
| R80.htm | 43051 | 2014-02-27 16:40:00 |
| R81.htm | 15013 | 2014-02-27 16:40:00 |
| R82.htm | 22619 | 2014-02-27 16:40:00 |
| R83.htm | 22551 | 2014-02-27 16:40:00 |
| R84.htm | 12434 | 2014-02-27 16:40:00 |
| R85.htm | 14787 | 2014-02-27 16:40:00 |
| R86.htm | 26849 | 2014-02-27 16:40:00 |
| R87.htm | 30858 | 2014-02-27 16:40:00 |
| R88.htm | 24945 | 2014-02-27 16:40:00 |
| R89.htm | 81363 | 2014-02-27 16:40:00 |
| R9.htm | 43421 | 2014-02-27 16:40:00 |
| R90.htm | 20780 | 2014-02-27 16:40:00 |
| R91.htm | 17827 | 2014-02-27 16:40:00 |
| R92.htm | 26862 | 2014-02-27 16:40:00 |
| R93.htm | 108490 | 2014-02-27 16:40:00 |
| R94.htm | 8969 | 2014-02-27 16:40:00 |
| R95.htm | 33307 | 2014-02-27 16:40:00 |
| R96.htm | 198867 | 2014-02-27 16:40:00 |
| R97.htm | 25764 | 2014-02-27 16:40:00 |
| R98.htm | 132329 | 2014-02-27 16:40:00 |
| R99.htm | 29380 | 2014-02-27 16:40:00 |
| report.css | 2740 | 2014-02-27 16:40:00 |
| Show.js | 1410 | 2014-02-27 16:40:00 |