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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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Balance Type:
Period Type:

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