Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flow from operating activities:
Net loss	$ (55,608)us-gaap_NetIncomeLoss	$ (11,517)us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	20,570us-gaap_DepreciationAndAmortization	39,661us-gaap_DepreciationAndAmortization
Impairments	35,381	0
Deferred income tax provision	2,973us-gaap_DeferredIncomeTaxExpenseBenefit	(1,222)us-gaap_DeferredIncomeTaxExpenseBenefit
Post-retirement and pension plan changes	1,262	1,012
Stock-based compensation	1,572us-gaap_ShareBasedCompensation	522us-gaap_ShareBasedCompensation
Interest expense	3,764us-gaap_PaidInKindInterest	3,645us-gaap_PaidInKindInterest
Other charges, net	(2,757)us-gaap_OtherNoncashExpense	(1,593)us-gaap_OtherNoncashExpense
(Increase) decrease in working capital	21,991	(6,665)
Increase in long-term assets and liabilities	(6,430)	(1,753)
Net cash used in operating activities	22,718	22,090
Cash flow from investing activities:
Capital expenditures	(13,601)	(21,728)
Proceeds from the sale of assets	521	1,895
Payments for derivative instruments	(7,603)	(367)
Insurance recoveries	0	3,057
Net cash used in investing activities	(20,683)	(17,143)
Cash flow from financing activities:
Short-term debt borrowings (reductions), net	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 fees	(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
Cash and cash equivalents at end of period	10,961	17,324
Change in current assets:
Accounts and notes receivable, net	1,040	(5,684)
Inventories	11,978us-gaap_IncreaseDecreaseInInventories	955us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	7,525	(4,670)
Increase (decrease) in accounts payable and accruals	(2,483)	6,506
Rationalizations	(846)gti_ChangeinRationalizationLiability	(8,580)gti_ChangeinRationalizationLiability
Increase in interest payable	4,777	4,808
(Increase) decrease in working capital	$ 21,991	$ (6,665)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 230

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- Definition

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

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Topic 230

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-Section 45

-Paragraph 12

-Subparagraph (c)

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

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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-Publisher FASB

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- Definition

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

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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