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Share Repurchases (Tables)

12 Months Ended

Dec. 31, 2015

Text Block [Abstract]

Summary of Share Repurchases under Stock Repurchase Plan

The following table summarizes share repurchases made under this program through December 31, 2015:

		shares				(thousands)
Authorized amount			n/a			$	50,000
Repurchases			755,310				(16,627	)
Remaining authorization						$	33,373

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- Definition

Table of repurchases of company stock pursuant to a board authorized repurchase program.

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No definition available.

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Namespace Prefix:	glt_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

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No definition available.

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