XML 55 R37.htm IDEA: XBRL DOCUMENT
v3.19.2

Stock-Based Compensation (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2019
Summary of Share Based Compensation Activity | The following table summarizes RSU and PSA activity during periods indicated:
Units |  | 2019 |  |  | 2018 |
Balance at January 1, |  |  | 756,786 |  |  |  | 929,386 |
Granted |  |  | 449,054 |  |  |  | 389,065 |
Forfeited |  |  | (127,603 | ) |  |  | (70,891 | )
Shares delivered |  |  | (163,078 | ) |  |  | (150,020 | )
Balance at June 30, |  |  | 915,159 |  |  |  | 1,097,540 |
Restricted Stock Units (RSU) and Performance Share Awards (PSAs) [Member] |
Compensation Expense for Stock Option Activity Included in Continuing Operations | The following table sets forth aggregate RSU and PSA compensation expense included in continuing operations for the periods indicated:
|  | June 30 |
In thousands |  | 2019 |  |  | 2018 |
Three months ended |  | $ | 1,161 |  |  | $ | 1,596 |
Six months ended |  |  | 1,595 |  |  |  | 3,261 |
Stock Only Stock Appreciation Rights (SOSARs) [Member] |
Summary of Share Based Compensation Activity | The following table sets forth information related to outstanding SOSARS:
|  | 2019 |  |  | 2018 |
SOSARS |  | Shares |  |  | Wtd Avg Exercise Price |  |  | Shares |  |  | Wtd Avg Exercise Price |
Outstanding at January 1, |  |  | 2,334,742 |  |  | $ | 18.08 |  |  |  | 2,561,846 |  |  | $ | 17.87 |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (441,920 | ) |  |  | 14.31 |  |  |  | (148,145 | ) |  |  | 13.26 |
Canceled / forfeited |  |  | (446,435 | ) |  |  | 21.06 |  |  |  | (20,994 | ) |  |  | 18.76 |
Outstanding at June 30, |  |  | 1,446,387 |  |  | $ | 19.31 |  |  |  | 2,392,707 |  |  | $ | 18.15 |
Compensation Expense for Stock Option Activity Included in Continuing Operations | The following table sets forth SOSAR compensation expense included in continuing operations for the periods indicated:
|  | June 30 |
In thousands |  | 2019 |  |  | 2018 |
Three months ended |  | $ | — |  |  | $ | 64 |
Six months ended |  |  | 43 |  |  |  | 244 |

X
- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=glt_RestrictedStockUnitsAndPerformanceShareAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_StockAppreciationRightsSARSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |