XML 52 R34.htm IDEA: XBRL DOCUMENT v3.20.4

Interest Expense (Tables)

12 Months Ended

Dec. 31, 2020

Interest and Debt Expense [Abstract]

Schedule Of Interest Expense

The following table presents an analysis of interest expense:

			For the Year Ended December 31
			2020						2019						2018
			(Dollars in thousands)
Interest incurred on debt			$	83,555					$	121,010					$	100,844
Related Party Promissory Note interest expense			—						—						5,090
2012 Senior Note redemption premium			—						—						4,782
Accretion of fair value adjustment on 2012 Senior Notes			—						—						19,414
Accretion of original issue discount on 2018 Term Loans			5,340						2,196						1,455
Amortization of debt issuance costs			9,179						4,125						3,476
Total interest expense			$	98,074					$	127,331					$	135,061

X

- Definition

Schedule of Interest Expense [Table Text Block]

+ References

No definition available.

+ Details

Name:	gti_ScheduleOfInterestExpenseTableTextBlock
Namespace Prefix:	gti_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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