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v2.4.1.9

Interest Expense (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 20, 2012
Debt Instrument [Line Items] |  |  |  |
Interest incurred on debt | $ 21,373 us-gaap_InterestExpenseDebt | $ 21,589 us-gaap_InterestExpenseDebt | $ 10,172 us-gaap_InterestExpenseDebt |
Amortization of discount on Senior Subordinated Notes | 12,298 us-gaap_AmortizationOfDebtDiscountPremium | 11,493 us-gaap_AmortizationOfDebtDiscountPremium | 10,742 us-gaap_AmortizationOfDebtDiscountPremium |
Amortization of debt issuance costs | 3,339 us-gaap_AmortizationOfFinancingCosts | 2,504 us-gaap_AmortizationOfFinancingCosts | 1,712 us-gaap_AmortizationOfFinancingCosts |
Supply Chain Financing mark-up | 47 gti_SupplyChainFinancingMarkUp | 451 gti_SupplyChainFinancingMarkUp | 621 gti_SupplyChainFinancingMarkUp |
Total interest expense | $ 37,057 us-gaap_InterestExpense | $ 36,037 us-gaap_InterestExpense | $ 23,247 us-gaap_InterestExpense |
Effective interest rate, revolving credit facility | 2.17%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod | 2.42%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod |  |
Senior subordinated notes implied rate | 7.00%us-gaap_SubordinatedBorrowingInterestRate |  |  |
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  |  |  | 6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember

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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 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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