XML 49 R27.htm IDEA: XBRL DOCUMENT
v3.23.2

Interest Expense (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2023
Interest and Debt Expense [Abstract] |
Schedule Of Interest Expense | The following table presents the components of interest expense:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
| (Dollars in thousands)
Interest incurred on debt | $ | 11,325 |  |  | $ | 10,927 |  |  | $ | 21,947 |  |  | $ | 22,285 |
Accretion of original issue discount | 1,308 |  |  | 338 |  |  | 1,476 |  |  | 865 |
Amortization of debt issuance costs | 2,488 |  |  | 932 |  |  | 3,143 |  |  | 2,176 |
Amortization of interest rate swap deferred (gains) losses | (45) |  |  | — |  |  | (45) |  |  | — |
Realized gain on termination of de-designated interest rate swap | (6,918) |  |  | — |  |  | (6,918) |  |  | — |
Unrealized loss (gain) on de-designated interest rate swap | 5,749 |  |  | (2,798) |  |  | 7,110 |  |  | (6,715) |
Total interest expense | $ | 13,907 |  |  | $ | 9,399 |  |  | $ | 26,713 |  |  | $ | 18,611 |

X
- Definition Schedule of Interest Expense [Table Text Block] + References No definition available. + Details
Name: | gti_ScheduleOfInterestExpenseTableTextBlock
Namespace Prefix: | gti_
Data Type: | dtr-types1: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