XML 49 R37.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Debt And Liquidity (Narrative) (Details) - USD ($) | Feb. 27, 2015 | Mar. 31, 2017 | Dec. 31, 2016 | Apr. 27, 2016 | Jul. 28, 2015 | Apr. 23, 2014 | Nov. 20, 2012
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Fair value of debt |  | $ 356,500,000 |  |  |  |  |
Long-term Debt |  | 379,602,000 | $ 365,432,000 |  |  |  |
Minimum Liquidity |  |  |  | $ 25,000,000 |  |  |
Outstanding letters of credit |  | 13,800,000 |  |  |  |  |
Term Loan Balance |  | 29,500,000 |  |  |  |  |
Revolving Credit Facility Balance |  | $ 73,800,000 |  |  |  |  |
Stated interest rate |  | 6.375% |  |  |  |  |
Loan balance, net of unamortized discount |  | $ 10,356,000 | 8,852,000 |  |  |  |
12 Month Trailing EBITDA |  |  | 75,000,000 |  |  |  |
12 Month Trailing EBITDA Minimum (Low End) |  |  |  | 40,000,000 |  |  |
12 Month Trailing EBITDA Minimum (High End) |  |  |  | 35,000,000 |  |  |
Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt |  | 275,732,000 | $ 274,132,000 |  |  |  |
Principal amount issued |  |  |  |  |  |  | $ 300,000,000
Stated interest rate |  |  |  |  |  |  | 6.375%
Redemption price, percentage of principal, prior to November 15, 2016 |  |  |  |  |  |  | 100.00%
Repurchase price, percentage of principal, due to change in control |  |  |  |  |  |  | 101.00%
Minimum | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unpaid indebtedness or accelerated proceeds exceeds |  | 50,000,000 |  |  |  |  |
Unpaid judgment or decree in excess of |  | $ 50,000,000 |  |  |  |  |
Amended and Restated Credit Agreement | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Undrawn commitment fee | 0.35% |  |  |  |  |  |
Amended and Restated Credit Agreement | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Undrawn commitment fee | 0.70% |  |  |  |  |  |
Amended and Restated Credit Agreement | LIBOR | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Margin spread on variable interest rate | 2.25% |  |  |  |  |  |
Amended and Restated Credit Agreement | LIBOR | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Margin spread on variable interest rate | 4.75% |  |  |  |  |  |
Amended and Restated Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  | $ 400,000,000 |
Amended and Restated Credit Agreement | Term Loan Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowing capacity | $ 40,000,000 |  |  |  |  |  |
Amended and Restated Credit Agreement July 2015 [Member] | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowing capacity |  |  |  | $ 225,000,000 | $ 375,000,000 |  |
Amended and Restated Credit Agreement July 2015 [Member] | Term Loan Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  | $ 40,000,000 |  |

X
- Definition 12 Month Trailing EBITDA + References No definition available. + Details
Name: | gti_A12MonthTrailingEBITDA
Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition 12 Month Trailing EBITDA Minimum (High End) + References No definition available. + Details
Name: | gti_A12MonthTrailingEBITDAMinimumHighEnd
Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition 12 Month Trailing EBITDA Minimum (Low End) + References No definition available. + Details
Name: | gti_A12MonthTrailingEBITDAMinimumLowEnd
Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum liquidity required by credit facility + References No definition available. + Details
Name: | gti_MinimumLiquidity
Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Redemption Price Percentage Of Principal + References No definition available. + Details
Name: | gti_RedemptionPricePercentageOfPrincipalPriorToNovember152016
Namespace Prefix: | gti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Repurchase Percentage Price Of Aggregate Principal Due To Change In Control + References No definition available. + Details
Name: | gti_RepurchasePercentagePriceOfAggregatePrincipalDueToChangeInControl
Namespace Prefix: | gti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Revolving credit facility portion of total credit facility outstanding + References No definition available. + Details
Name: | gti_RevolvingCreditFacilityBalance
Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Term loan portion of revolving credit facility balance + References No definition available. + Details
Name: | gti_TermLoanBalance
Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unpaid Indebtness After Maturity Or Acceleration + References No definition available. + Details
Name: | gti_UnpaidIndebtnessAfterMaturityOrAcceleration
Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unpaid Judgment Or Decree + References No definition available. + Details
Name: | gti_UnpaidJudgmentOrDecree
Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gti_AmendedandRestatedCreditAgreementFebruary2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=gti_TermLoanFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gti_AmendedandRestatedCreditAgreementJuly2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |