Guarantor Infromation (Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 22,718	$ 22,090
Cash flow from investing activities:
(Loans to) repayments from affiliates	0gti_RepaymentsFromLoansToAffiliates	0gti_RepaymentsFromLoansToAffiliates
Capital expenditures	(13,601)	(21,728)
Proceeds from derivative instruments	(7,603)	(367)
Proceeds from the sale of assets	521	1,895
Insurance recoveries	0	3,057
Net cash used in investing activities	(20,683)	(17,143)
Cash flow from financing activities:
Repayments to affiliates	0
Loans from (repayments to) affiliates		0
Short-term debt borrowings	1	(994)
Revolving Facility borrowings	27,000us-gaap_ProceedsFromLinesOfCredit	75,000us-gaap_ProceedsFromLinesOfCredit
Revolving Facility reductions	(32,000)us-gaap_RepaymentsOfLinesOfCredit	(65,000)us-gaap_RepaymentsOfLinesOfCredit
Principal payments on long term debt	(33)us-gaap_RepaymentsOfLongTermDebt	(92)us-gaap_RepaymentsOfLongTermDebt
Supply chain financing	0gti_SupplyChainFinancing	(9,455)gti_SupplyChainFinancing
Proceeds from exercise of stock options	0	82
Purchase of treasury shares	(41)	(141)
Revolving Facility refinancing	(2,247)us-gaap_PaymentsOfFinancingCosts	0us-gaap_PaymentsOfFinancingCosts
Other	(54)	918
Net cash provided by financing activities	(7,374)	318
Net (decrease) increase in cash and cash equivalents	(5,339)	5,265
Effect of exchange rate changes on cash and cash equivalents	(1,250)	171
Cash and cash equivalents at beginning of period	17,550	11,888	17,324	11,888
Cash and cash equivalents at end of period	10,961	17,324	17,324	11,888
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	1,136	496
Cash flow from investing activities:
(Loans to) repayments from affiliates	(1,095)	(1,355)
Capital expenditures	0	0
Proceeds from derivative instruments	0	0
Proceeds from the sale of assets	0
Insurance recoveries	0	0
Net cash used in investing activities	(1,095)	(1,355)
Cash flow from financing activities:
Repayments to affiliates	0
Loans from (repayments to) affiliates		0
Short-term debt borrowings	0	0
Revolving Facility borrowings	0	0
Revolving Facility reductions	0	0
Principal payments on long term debt	0	0
Supply chain financing	0	0
Proceeds from exercise of stock options	0	82
Purchase of treasury shares	(41)	(141)
Revolving Facility refinancing	0
Other	0	918
Net cash provided by financing activities	(41)	859
Net (decrease) increase in cash and cash equivalents	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	17,731	31,748
Cash flow from investing activities:
(Loans to) repayments from affiliates	0	0
Capital expenditures	(8,777)	(16,486)
Proceeds from derivative instruments	(6,776)	(258)
Proceeds from the sale of assets	394	714
Insurance recoveries	0	0
Net cash used in investing activities	(15,159)	(16,030)
Cash flow from financing activities:
Repayments to affiliates	1,095
Loans from (repayments to) affiliates		1,355
Short-term debt borrowings	1	(11)
Revolving Facility borrowings	27,000	30,000
Revolving Facility reductions	(32,000)	(46,000)
Principal payments on long term debt	(33)	(32)
Supply chain financing	0	0
Proceeds from exercise of stock options	0	0
Purchase of treasury shares	0	0
Revolving Facility refinancing	(2,247)
Other	(54)	0
Net cash provided by financing activities	(6,238)	(14,688)
Net (decrease) increase in cash and cash equivalents	(3,666)	1,030
Effect of exchange rate changes on cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	5,503	4,752
Cash and cash equivalents at end of period	1,837	5,782
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	3,851	(10,154)
Cash flow from investing activities:
(Loans to) repayments from affiliates	0	0
Capital expenditures	(4,824)	(5,242)
Proceeds from derivative instruments	(827)	(109)
Proceeds from the sale of assets	127	1,181
Insurance recoveries	0	3,057
Net cash used in investing activities	(5,524)	(1,113)
Cash flow from financing activities:
Repayments to affiliates	0
Loans from (repayments to) affiliates		0
Short-term debt borrowings	0	(983)
Revolving Facility borrowings	0	45,000
Revolving Facility reductions	0	(19,000)
Principal payments on long term debt	0	(60)
Supply chain financing	0	(9,455)
Proceeds from exercise of stock options	0	0
Purchase of treasury shares	0	0
Revolving Facility refinancing	0
Other	0	0
Net cash provided by financing activities	0	15,502
Net (decrease) increase in cash and cash equivalents	(1,673)	4,235
Effect of exchange rate changes on cash and cash equivalents	(1,250)	171
Cash and cash equivalents at beginning of period	12,047	7,136
Cash and cash equivalents at end of period	9,124	11,542
Consolidating Entries and Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	0	0
Cash flow from investing activities:
(Loans to) repayments from affiliates	1,095	1,355
Capital expenditures	0	0
Proceeds from derivative instruments	0	0
Proceeds from the sale of assets	0
Insurance recoveries	0	0
Net cash used in investing activities	1,095	1,355
Cash flow from financing activities:
Repayments to affiliates	(1,095)
Loans from (repayments to) affiliates		(1,355)
Short-term debt borrowings	0	0
Revolving Facility borrowings	0	0
Revolving Facility reductions	0	0
Principal payments on long term debt	0	0
Supply chain financing	0	0
Proceeds from exercise of stock options	0	0
Purchase of treasury shares	0	0
Revolving Facility refinancing	0
Other	0	0
Net cash provided by financing activities	(1,095)	(1,355)
Net (decrease) increase in cash and cash equivalents	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$ 0	$ 0

Repayments from (Loans to) Affiliates

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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. Includes 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 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 associated with the acquisition or sale of a business segment during the period.

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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 cash outflow to reacquire common stock during the period.

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The cash outflow for loan and debt issuance costs.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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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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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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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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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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