XML 104 R91.htm IDEA: XBRL DOCUMENT v2.4.0.6

Retirement Plans and Other Post-Retirement Benefits (Details 12) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Nonqualified pension plans [Member]
Benefit payments expected under non-qualified pension plans and other benefit plans
Benefit payments expected	$ 2,014
Other benefit plans [Member]
Benefit payments expected under non-qualified pension plans and other benefit plans
Benefit payments expected	$ 4,238

X

- Definition

Defined benefits plan expected benefit payments.

+ References

No definition available.

+ Details

Name:	glt_DefinedBenefitsPlanExpectedBenefitPayments
Namespace Prefix:	glt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	glt_ScheduleOfExpectedBenefitPaymentsUnderNonQualifiedPensionPlansAndOtherBenefitPlansAbstract
Namespace Prefix:	glt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration