XML 28 R67.htm IDEA: XBRL DOCUMENT v2.4.0.8

Subsequent Events (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
	Apr. 23, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 470,000,000
Amortization of Financing Costs and Discounts		$ 762,000	$ 588,000	$ 1,395,000	$ 1,143,000
Percentage Of One Month Interest rate Plus London Interbank Offering Rate	1.00%
Debt Instrument Interest Coverage Ratio	2.50
Debt Instrument Leverage Ratio	3.00
Maximum [Member]
Subsequent Event [Line Items]
Percentage Of Margin Plus London Interbank Offered Rate	2.00%
Percentage Of Margin Plus Alternate Base Rate	1.00%
Line of Credit Facility, Commitment Fee Percentage	0.35%
Minimum [Member]
Subsequent Event [Line Items]
Percentage Of Margin Plus London Interbank Offered Rate	1.25%
Percentage Of Margin Plus Alternate Base Rate	0.25%
Line of Credit Facility, Commitment Fee Percentage	0.20%

X

- Definition

Debt instrument interest coverage ratio.

+ References

No definition available.

+ Details

Name:	gti_DebtInstrumentInterestCoverageRatio
Namespace Prefix:	gti_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Debt instrument leverage ratio.

+ References

No definition available.

+ Details

Name:	gti_DebtInstrumentLeverageRatio
Namespace Prefix:	gti_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of margin plus alternate base rate.

+ References

No definition available.

+ Details

Name:	gti_PercentageOfMarginPlusAlternateBaseRate
Namespace Prefix:	gti_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of margin plus London interbank offered rate.

+ References

No definition available.

+ Details

Name:	gti_PercentageOfMarginPlusLondonInterbankOfferedRate
Namespace Prefix:	gti_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage Of One Month Interest rate Plus London Interbank Offering Rate

+ References

No definition available.

+ Details

Name:	gti_PercentageOfOneMonthInterestRatePlusLondonInterbankOfferingRate
Namespace Prefix:	gti_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	us-gaap_AmortizationOfFinancingCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration