Supplemental Guarantor Information Cashflows (Details) 2 (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 120,903	$ 116,837	$ 101,400
Cash flow from investing activities:
(Loans to) repayments from affiliates	0gti_RepaymentsFromLoansToAffiliates	0gti_RepaymentsFromLoansToAffiliates	0gti_RepaymentsFromLoansToAffiliates
Capital expenditures	(84,981)	(86,344)	(127,728)
Insurance recoveries	2,834	1,500	0
Proceeds from derivative instruments	(2,025)	114	7,572
Proceeds from the sale of fixed assets	5,042	0	0
Other	178	929	194
Net cash used in investing activities	(78,952)	(83,801)	(119,962)
Loans from (repayments to) affiliates	0	0	0
Dividends to affiliates			0
Short-term debt borrowings	(1,021)	(7,265)	(5,738)
Revolving Facility borrowings	269,000us-gaap_ProceedsFromLinesOfCredit	166,000us-gaap_ProceedsFromLinesOfCredit	425,000us-gaap_ProceedsFromLinesOfCredit
Revolving Facility reductions	(293,000)us-gaap_RepaymentsOfLinesOfCredit	(171,500)us-gaap_RepaymentsOfLinesOfCredit	(587,500)us-gaap_RepaymentsOfLinesOfCredit
Proceeds from long-term debt	0	0	300,000
Principal payments on long term debt	(192)us-gaap_RepaymentsOfLongTermDebt	(225)us-gaap_RepaymentsOfLongTermDebt	(225)us-gaap_RepaymentsOfLongTermDebt
Supply chain financing	(9,455)gti_SupplyChainFinancing	(17,508)gti_SupplyChainFinancing	(2,967)gti_SupplyChainFinancing
Proceeds from exercise of stock options	2,813	448	157
Purchase of treasury shares	(894)	(1,825)	(103,445)
Refinancing fees and debt issuance costs	(3,279)us-gaap_PaymentsOfDebtIssuanceCosts	(560)us-gaap_PaymentsOfDebtIssuanceCosts	(6,385)us-gaap_PaymentsOfDebtIssuanceCosts
Other	951	(5,210)	5,215
Net cash provided by (used in) financing activities	(35,077)	(37,645)	24,112
Cash and Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	6,874	(4,609)	5,550
Effect of exchange rate changes on cash and cash equivalents	(1,212)	(820)	(662)
Cash and cash equivalents at beginning of period	11,888	17,317	12,429	12,429
Cash and cash equivalents at end of period	17,550	11,888	17,317	12,429
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(9,474)	(13,718)	44,361
Cash flow from investing activities:
(Loans to) repayments from affiliates	6,604	15,578	(66,869)
Capital expenditures	0	0	0
Insurance recoveries	0	0
Proceeds from derivative instruments	0	0	0
Proceeds from the sale of fixed assets	0
Other	0	0	0
Net cash used in investing activities	6,604	15,578	(66,869)
Loans from (repayments to) affiliates	0	0	(169,656)
Dividends to affiliates			0
Short-term debt borrowings	0	0	0
Revolving Facility borrowings	0	0	0
Revolving Facility reductions	0	0	0
Proceeds from long-term debt			300,000
Principal payments on long term debt	0	0	0
Supply chain financing	0	0	0
Proceeds from exercise of stock options	2,813	448	157
Purchase of treasury shares	(894)	(1,825)	(103,445)
Refinancing fees and debt issuance costs	0	(483)	(5,018)
Other	951	0	104
Net cash provided by (used in) financing activities	2,870	(1,860)	22,142
Cash and Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	0	0	(366)
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	0	0	366
Cash and cash equivalents at end of period	0	0	0
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	79,864	72,111	85,973
Cash flow from investing activities:
(Loans to) repayments from affiliates	0	15,000	158,985
Capital expenditures	(58,926)	(52,278)	(91,183)
Insurance recoveries	0	0
Proceeds from derivative instruments	(2,195)	437	3,166
Proceeds from the sale of fixed assets	1,700
Other	0	322	0
Net cash used in investing activities	(59,421)	(36,519)	70,968
Loans from (repayments to) affiliates	(6,604)	(15,578)	66,869
Dividends to affiliates			(52,000)
Short-term debt borrowings	(34)	(6)	(7,493)
Revolving Facility borrowings	183,000	75,000	292,000
Revolving Facility reductions	(193,000)	(94,500)	(454,500)
Proceeds from long-term debt			0
Principal payments on long term debt	(132)	(166)	(171)
Supply chain financing	0	0	0
Proceeds from exercise of stock options	0	0	0
Purchase of treasury shares	0	0	0
Refinancing fees and debt issuance costs	(2,922)	(15)	(724)
Other	0	0	0
Net cash provided by (used in) financing activities	(19,692)	(35,265)	(156,019)
Cash and Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	751	327	922
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	4,752	4,425	3,503
Cash and cash equivalents at end of period	5,503	4,752	4,425
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	50,513	58,444	23,066
Cash flow from investing activities:
(Loans to) repayments from affiliates	0	0	0
Capital expenditures	(26,055)	(34,066)	(36,545)
Insurance recoveries	2,834	1,500
Proceeds from derivative instruments	170	(323)	4,406
Proceeds from the sale of fixed assets	3,342
Other	178	607	194
Net cash used in investing activities	(19,531)	(32,282)	(31,945)
Loans from (repayments to) affiliates	0	(15,000)	10,671
Dividends to affiliates			0
Short-term debt borrowings	(987)	(7,259)	1,755
Revolving Facility borrowings	86,000	91,000	133,000
Revolving Facility reductions	(100,000)	(77,000)	(133,000)
Proceeds from long-term debt			0
Principal payments on long term debt	(60)	(59)	(54)
Supply chain financing	(9,455)	(17,508)	(2,967)
Proceeds from exercise of stock options	0	0	0
Purchase of treasury shares	0	0	0
Refinancing fees and debt issuance costs	(357)	(62)	(643)
Other	0	(5,210)	5,111
Net cash provided by (used in) financing activities	(24,859)	(31,098)	13,873
Cash and Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	6,123	(4,936)	4,994
Effect of exchange rate changes on cash and cash equivalents	(1,212)	(820)	(662)
Cash and cash equivalents at beginning of period	7,136	12,892	8,560
Cash and cash equivalents at end of period	12,047	7,136	12,892
Consolidating Entries and Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	0	0	(52,000)
Cash flow from investing activities:
(Loans to) repayments from affiliates	(6,604)	(30,578)	(92,116)
Capital expenditures	0	0	0
Insurance recoveries	0	0
Proceeds from derivative instruments	0	0	0
Other	0	0	0
Net cash used in investing activities	(6,604)	(30,578)	(92,116)
Loans from (repayments to) affiliates	6,604	30,578	92,116
Dividends to affiliates			52,000
Short-term debt borrowings	0	0	0
Revolving Facility borrowings	0	0	0
Revolving Facility reductions	0	0	0
Proceeds from long-term debt			0
Principal payments on long term debt	0	0	0
Supply chain financing	0	0	0
Proceeds from exercise of stock options	0	0	0
Purchase of treasury shares	0	0	0
Refinancing fees and debt issuance costs	0	0	0
Other	0	0	0
Net cash provided by (used in) financing activities	6,604	30,578	144,116
Cash and Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	0	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	$ 0	$ 0	$ 0

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Supply chain financing.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes effect from exchange rate changes.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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Amount of dividends or interest. Give totals for each group. If operations of any controlled companies are different in character from those of the company, group such affiliates (1) within divisions and (2) by type of activities.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The net cash outflow or inflow from derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow to reacquire common stock during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows.

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The cash inflow from other long-term borrowings not otherwise defined in the taxonomy (with maturities initially due beyond one year or the normal operating cycle of the entity, if longer).

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Amount of cash inflow (outflow) from long-term debt by a related party. Related parties, include, but are not limited to, affiliates, owners or officers and their immediate families, and pension trusts.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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