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Retirement Plans and Other Post-Retirement Benefits (Details 12) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012
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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

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- Definition Defined benefits plan expected benefit payments. + References No definition available. + Details
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Namespace Prefix: | glt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | glt_
Data Type: | xbrli:stringItemType
Balance Type: | na
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