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Interest Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Interest and Debt Expense [Abstract]
Interest incurred on debt	$ 5,171us-gaap_InterestExpenseDebt	$ 5,322us-gaap_InterestExpenseDebt
Amortization of discount on Senior Subordinated Notes	3,207us-gaap_AmortizationOfDebtDiscountPremium	2,997us-gaap_AmortizationOfDebtDiscountPremium
Amortization of debt issuance costs	543us-gaap_AmortizationOfFinancingCosts	633us-gaap_AmortizationOfFinancingCosts
Supply Chain Financing mark-up	0gti_SupplyChainFinancingMarkUp	47gti_SupplyChainFinancingMarkUp
Total interest expense	$ 8,921us-gaap_InterestExpense	$ 8,999us-gaap_InterestExpense
Effective interest rate, revolving credit facility	2.44%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod	2.17%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
Senior Subordinated Notes implied rate	7.00%us-gaap_SubordinatedBorrowingInterestRate
Stated interest rate			6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage

X

- Definition

Supply Chain Financing Mark Up

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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-Name Regulation S-X (SX)

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The effective interest rate during the reporting period.

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Stated interest rate of the subordinated debt.

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