XML 53 R36.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Capitalized Interest (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2018
Interest Expense [Abstract] |
Summary of Interest Incurred, Capitalized and Expensed Included in Continuing Operations | The following table sets forth details of interest incurred, capitalized and expensed included in continuing operations:
|  | Three months ended September 30 |  |  | Nine months ended September 30 |
In thousands |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Interest cost incurred |  | $ | 3,965 |  |  | $ | 3,856 |  |  | $ | 11,633 |  |  | $ | 11,219 |
Interest capitalized |  |  | - |  |  |  | 532 |  |  |  | 396 |  |  |  | 1,194 |
Interest expense |  | $ | 3,965 |  |  | $ | 3,324 |  |  | $ | 11,237 |  |  | $ | 10,025 |

X
- Definition Summary of interest incurred, capitalized and expensed. + References No definition available. + Details
Name: | glt_SummaryOfInterestIncurredCapitalizedAndExpensedTableTextBlock
Namespace Prefix: | glt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InterestExpenseAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration