Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flow from operating activities:
Net income (loss)	$ (285,376)us-gaap_NetIncomeLoss	$ (27,259)us-gaap_NetIncomeLoss	$ 117,641us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	119,708us-gaap_DepreciationAndAmortization	123,397us-gaap_DepreciationAndAmortization	81,660us-gaap_DepreciationAndAmortization
Impairment of long-lived assets and goodwill	197,220	0	0
Rationalization related fixed asset write offs	926	8,010	0
Inventory write-downs	19,600us-gaap_InventoryWriteDown	0us-gaap_InventoryWriteDown	0us-gaap_InventoryWriteDown
Deferred income tax benefit	(16,003)us-gaap_DeferredIncomeTaxExpenseBenefit	(22,369)us-gaap_DeferredIncomeTaxExpenseBenefit	8,130us-gaap_DeferredIncomeTaxExpenseBenefit
Post-retirement and pension plan changes	23,047	(10,544)	13,349
Stock-based compensation	5,577us-gaap_ShareBasedCompensation	8,035us-gaap_ShareBasedCompensation	9,601us-gaap_ShareBasedCompensation
Interest expense	15,693us-gaap_PaidInKindInterest	14,052us-gaap_PaidInKindInterest	12,500us-gaap_PaidInKindInterest
Insurance recoveries	0	0	4,007
Other charges, net	1,441us-gaap_OtherNoncashExpense	7,162us-gaap_OtherNoncashExpense	(20,001)us-gaap_OtherNoncashExpense
(Increase) decrease in working capital	56,846	31,980	(106,220)
Increase in long-term assets and liabilities	(17,776)	(15,627)	(19,267)
Net cash provided by operating activities	120,903	116,837	101,400
Cash flow from investing activities:
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)
Cash flow from financing activities:
Short-term debt (reductions) borrowings, net	(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
Net increase (decrease) in cash and cash equivalents	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
Cash and cash equivalents at end of period	17,550	11,888	17,317
Supplemental disclosures of cash flow information:
Interest	21,549us-gaap_InterestPaidNet	21,825us-gaap_InterestPaidNet	9,279us-gaap_InterestPaidNet
Income taxes	10,611us-gaap_IncomeTaxesPaidNet	8,357us-gaap_IncomeTaxesPaidNet	26,209us-gaap_IncomeTaxesPaidNet
Non-cash operating, investing and financing activities:
Common stock issued to savings and pension plan trusts	4,381us-gaap_StockIssued1	4,561us-gaap_StockIssued1	4,593us-gaap_StockIssued1
(Increase) decrease in current assets:
Accounts and notes receivable, net	28,466	37,366	(5,563)
Inventories	77,875us-gaap_IncreaseDecreaseInInventories	14,324us-gaap_IncreaseDecreaseInInventories	(67,314)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(14,898)	(209)	(2,281)
Increase (decrease) in accounts payables and accruals	(25,849)	(38,198)	(32,759)
Change in Rationalization Liability	(8,732)gti_ChangeinRationalizationLiability	18,421gti_ChangeinRationalizationLiability	0gti_ChangeinRationalizationLiability
Increase in interest payable	(16)	276	1,697
(Increase) decrease in working capital	$ 56,846	$ 31,980	$ (106,220)

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-Section 03

-Paragraph 19

-Article 5

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- Definition

Other expenses or losses included in net income that result in no cash outflows or inflows in the period and are not separately disclosed.

+ References

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- Definition

Interest paid other than in cash for example by issuing additional debt securities. As a noncash item, it is added to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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- Definition

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

+ References

No definition available.

+ Details

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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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 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.

+ References

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

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-Paragraph 2

-Subparagraph (SX 210.5-03.4)

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-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

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- Definition

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.

+ References

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-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

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 operating activities. It excludes insurance settlements classified as investing cash flows, for example, insurance settlements related to fixed assets.

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-Paragraph 16

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- Definition

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).

+ References

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- Definition

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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-Publisher FASB

-Name Accounting Standards Codification

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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.

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-Publisher FASB

-Name Accounting Standards Codification

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

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-SubTopic 10

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-Paragraph 9

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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

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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

-Name Accounting Standards Codification

-Glossary Financing Activities

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

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-Paragraph 2

-Subparagraph (j)

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-Subparagraph (SX 210.4-08.(f))

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

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Balance Type:	credit
Period Type:	duration

- 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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-Publisher FASB

-Name Accounting Standards Codification

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

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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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Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- Definition

The fair value of stock issued in noncash financing activities.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Paragraph 4

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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