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v2.4.1.9

Guarantor Infromation (Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012
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ASSETS |  |  |  |  |  |
Cash and cash equivalents | $ 10,961 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 17,550 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 17,324 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 11,888 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 17,324 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 11,888 us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable - affiliates | 0 us-gaap_AccountsReceivableRelatedPartiesCurrent | 0 us-gaap_AccountsReceivableRelatedPartiesCurrent |  |  |  |
Accounts receivable - trade | 155,108 us-gaap_AccountsReceivableNetCurrent | 162,919 us-gaap_AccountsReceivableNetCurrent |  |  |  |
Inventories | 364,152 us-gaap_InventoryNet | 382,903 us-gaap_InventoryNet |  |  |  |
Prepaid expenses and other current assets | 70,475 us-gaap_PrepaidExpenseCurrent | 81,623 us-gaap_PrepaidExpenseCurrent |  |  |  |
Total current assets | 600,696 us-gaap_AssetsCurrent | 644,995 us-gaap_AssetsCurrent |  |  |  |
Investment in affiliates | 0 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue | 0 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue |  |  |  |
Net property, plant and equipment | 633,339 us-gaap_PropertyPlantAndEquipmentNet | 654,040 us-gaap_PropertyPlantAndEquipmentNet |  |  |  |
Deferred income taxes | 14,819 us-gaap_DeferredTaxAssetsNetNoncurrent | 16,819 us-gaap_DeferredTaxAssetsNetNoncurrent |  |  |  |
Goodwill | 384,436 us-gaap_Goodwill | 420,129 us-gaap_Goodwill |  |  |  |
Notes receivable - affiliate | 0 us-gaap_NotesReceivableRelatedPartiesNoncurrent | 0 us-gaap_NotesReceivableRelatedPartiesNoncurrent |  |  |  |
Other assets | 92,373 us-gaap_OtherAssetsNoncurrent | 97,822 us-gaap_OtherAssetsNoncurrent |  |  |  |
Total assets | 1,725,663 us-gaap_Assets | 1,833,805 us-gaap_Assets |  |  |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |  |  |
Accounts payable - affiliate | 0 us-gaap_AccountsPayableRelatedPartiesCurrent | 0 us-gaap_AccountsPayableRelatedPartiesCurrent |  |  |  |
Accounts payable - trade | 79,756 us-gaap_AccountsPayableCurrent | 86,409 us-gaap_AccountsPayableCurrent |  |  |  |
Short-term debt | 191,446 us-gaap_ShortTermBorrowings | 188,104 us-gaap_ShortTermBorrowings |  |  |  |
Accrued income and other taxes | 17,321 us-gaap_TaxesPayableCurrent | 24,506 us-gaap_TaxesPayableCurrent |  |  |  |
Rationalizations | 8,632 gti_RestructuringandRelatedLiability | 9,563 gti_RestructuringandRelatedLiability |  |  |  |
Supply chain financing liability | 0 us-gaap_OtherShortTermBorrowings | 0 us-gaap_OtherShortTermBorrowings |  |  |  |
Other accrued liabilities | 41,946 us-gaap_OtherAccruedLiabilitiesCurrent | 43,319 us-gaap_OtherAccruedLiabilitiesCurrent |  |  |  |
Total current liabilities | 339,101 us-gaap_LiabilitiesCurrent | 351,901 us-gaap_LiabilitiesCurrent |  |  |  |
Long-term debt - affiliate | 0 us-gaap_DueToRelatedPartiesNoncurrent | 0 us-gaap_DueToRelatedPartiesNoncurrent |  |  |  |
Long-term debt - third party | 336,321 us-gaap_LongTermDebtNoncurrent | 341,615 us-gaap_LongTermDebtNoncurrent |  |  |  |
Other long-term obligations | 100,983 us-gaap_OtherLiabilitiesNoncurrent | 107,566 us-gaap_OtherLiabilitiesNoncurrent |  |  |  |
Deferred income taxes | 26,507 us-gaap_DeferredTaxLiabilitiesNoncurrent | 28,197 us-gaap_DeferredTaxLiabilitiesNoncurrent |  |  |  |
Total stockholders' equity | 922,751 us-gaap_StockholdersEquity | 1,004,526 us-gaap_StockholdersEquity |  |  |  |
Total liabilities and stockholders' equity | 1,725,663 us-gaap_LiabilitiesAndStockholdersEquity | 1,833,805 us-gaap_LiabilitiesAndStockholdersEquity |  |  |  |
Parent Company [Member] |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Cash and cash equivalents | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accounts receivable - affiliates | 41,988 us-gaap_AccountsReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 40,474 us-gaap_AccountsReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Accounts receivable - trade | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Inventories | 0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Prepaid expenses and other current assets | 0 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Total current assets | 41,988 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 40,474 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Investment in affiliates | 1,338,408 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,414,278 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Net property, plant and equipment | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Deferred income taxes | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Goodwill | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Notes receivable - affiliate | 36,817 us-gaap_NotesReceivableRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 35,722 us-gaap_NotesReceivableRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Other assets | 3,985 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,110 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Total assets | 1,421,198 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,494,584 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |  |  |
Accounts payable - affiliate | 0 us-gaap_AccountsPayableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_AccountsPayableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Accounts payable - trade | 43 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 47 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Short-term debt | 191,179 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 187,973 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Accrued income and other taxes | 0 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 344 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Rationalizations | 0 gti_RestructuringandRelatedLiability / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 gti_RestructuringandRelatedLiability / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Supply chain financing liability | 0 us-gaap_OtherShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Other accrued liabilities | 7,225 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,444 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Total current liabilities | 198,447 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 190,808 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Long-term debt - affiliate | 0 us-gaap_DueToRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_DueToRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Long-term debt - third party | 300,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 300,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Other long-term obligations | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Deferred income taxes | 0 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Total stockholders' equity | 922,751 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,003,776 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Total liabilities and stockholders' equity | 1,421,198 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,494,584 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Guarantor Subsidiaries [Member] |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Cash and cash equivalents | 1,837 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,503 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,782 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 4,752 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accounts receivable - affiliates | 18,786 us-gaap_AccountsReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 35,618 us-gaap_AccountsReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Accounts receivable - trade | 36,890 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 45,861 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Inventories | 145,506 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 148,080 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Prepaid expenses and other current assets | 13,091 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 17,336 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Total current assets | 216,110 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 252,398 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Investment in affiliates | 735,037 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 762,251 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Net property, plant and equipment | 427,681 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 431,602 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Deferred income taxes | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Goodwill | 181,718 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 217,099 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Notes receivable - affiliate | 7,413 us-gaap_NotesReceivableRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 7,413 us-gaap_NotesReceivableRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Other assets | 44,190 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 45,617 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Total assets | 1,612,149 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,716,380 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |  |  |
Accounts payable - affiliate | 72,904 us-gaap_AccountsPayableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 80,659 us-gaap_AccountsPayableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Accounts payable - trade | 33,527 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 35,435 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Short-term debt | 132 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 131 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Accrued income and other taxes | 2,070 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 3,380 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Rationalizations | 5,820 gti_RestructuringandRelatedLiability / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 7,538 gti_RestructuringandRelatedLiability / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Supply chain financing liability | 0 us-gaap_OtherShortTermBorrowings / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_OtherShortTermBorrowings / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Other accrued liabilities | 10,930 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 15,252 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Total current liabilities | 125,383 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 142,395 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Long-term debt - affiliate | 36,817 us-gaap_DueToRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 35,722 us-gaap_DueToRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Long-term debt - third party | 35,360 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 40,393 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Other long-term obligations | 71,051 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 77,724 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Deferred income taxes | 5,130 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,118 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Total stockholders' equity | 1,338,408 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,415,028 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Total liabilities and stockholders' equity | 1,612,149 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,716,380 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Cash and cash equivalents | 9,124 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 12,047 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 11,542 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 7,136 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Accounts receivable - affiliates | 30,911 us-gaap_AccountsReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 40,185 us-gaap_AccountsReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Accounts receivable - trade | 118,218 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 117,058 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Inventories | 218,646 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 234,823 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Prepaid expenses and other current assets | 57,384 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 64,287 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Total current assets | 434,283 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 468,400 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Investment in affiliates | 0 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Net property, plant and equipment | 205,658 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 222,438 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Deferred income taxes | 14,819 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 16,819 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Goodwill | 202,718 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 203,030 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Notes receivable - affiliate | 0 us-gaap_NotesReceivableRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_NotesReceivableRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Other assets | 44,198 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 48,095 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Total assets | 901,676 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 958,782 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |  |  |
Accounts payable - affiliate | 18,781 us-gaap_AccountsPayableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 35,618 us-gaap_AccountsPayableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Accounts payable - trade | 46,186 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 50,927 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Short-term debt | 135 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Accrued income and other taxes | 15,251 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 20,782 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Rationalizations | 2,812 gti_RestructuringandRelatedLiability / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2,025 gti_RestructuringandRelatedLiability / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Supply chain financing liability | 0 us-gaap_OtherShortTermBorrowings / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_OtherShortTermBorrowings / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Other accrued liabilities | 23,791 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 25,623 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Total current liabilities | 106,956 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 134,975 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Long-term debt - affiliate | 7,413 us-gaap_DueToRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 7,413 us-gaap_DueToRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Long-term debt - third party | 961 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,222 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Other long-term obligations | 29,932 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 29,842 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Deferred income taxes | 21,377 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 23,079 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Total stockholders' equity | 735,037 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 762,251 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Total liabilities and stockholders' equity | 901,676 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 958,782 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Consolidating Entries and Eliminations [Member] |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Cash and cash equivalents | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Accounts receivable - affiliates | (91,685)us-gaap_AccountsReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (116,277)us-gaap_AccountsReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Accounts receivable - trade | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Inventories | 0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Prepaid expenses and other current assets | 0 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Total current assets | (91,685)us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (116,277)us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Investment in affiliates | (2,073,445)us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (2,176,529)us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Net property, plant and equipment | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Deferred income taxes | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Goodwill | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Notes receivable - affiliate | (44,230)us-gaap_NotesReceivableRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (43,135)us-gaap_NotesReceivableRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Other assets | 0 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Total assets | (2,209,360)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (2,335,941)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |  |  |
Accounts payable - affiliate | (91,685)us-gaap_AccountsPayableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (116,277)us-gaap_AccountsPayableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Accounts payable - trade | 0 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Short-term debt | 0 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Accrued income and other taxes | 0 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Rationalizations | 0 gti_RestructuringandRelatedLiability / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 gti_RestructuringandRelatedLiability / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Supply chain financing liability | 0 us-gaap_OtherShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Other accrued liabilities | 0 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Total current liabilities | (91,685)us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (116,277)us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Long-term debt - affiliate | (44,230)us-gaap_DueToRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (43,135)us-gaap_DueToRelatedPartiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Long-term debt - third party | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Other long-term obligations | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Deferred income taxes | 0 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Total stockholders' equity | (2,073,445)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (2,176,529)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Total liabilities and stockholders' equity | $ (2,209,360)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ (2,335,941)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |

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