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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]                      
Net sales $ 436,261us-gaap_SalesRevenueGoodsNet $ 465,092us-gaap_SalesRevenueGoodsNet $ 445,341us-gaap_SalesRevenueGoodsNet $ 455,721us-gaap_SalesRevenueGoodsNet $ 434,811us-gaap_SalesRevenueGoodsNet $ 456,648us-gaap_SalesRevenueGoodsNet $ 425,967us-gaap_SalesRevenueGoodsNet $ 405,189us-gaap_SalesRevenueGoodsNet $ 1,802,415us-gaap_SalesRevenueGoodsNet $ 1,722,615us-gaap_SalesRevenueGoodsNet $ 1,577,788us-gaap_SalesRevenueGoodsNet
Energy and related sales, net                 7,927glt_EnergyAndRelatedSalesNet 3,153glt_EnergyAndRelatedSalesNet 7,000glt_EnergyAndRelatedSalesNet
Total revenues                 1,810,342us-gaap_SalesRevenueNet 1,725,768us-gaap_SalesRevenueNet 1,584,788us-gaap_SalesRevenueNet
Costs of products sold                 1,575,188us-gaap_CostOfGoodsSold 1,507,108us-gaap_CostOfGoodsSold 1,371,139us-gaap_CostOfGoodsSold
Gross profit 58,164us-gaap_GrossProfit 80,513us-gaap_GrossProfit 41,437us-gaap_GrossProfit 55,040us-gaap_GrossProfit 54,406us-gaap_GrossProfit 66,039us-gaap_GrossProfit 40,840us-gaap_GrossProfit 57,375us-gaap_GrossProfit 235,154us-gaap_GrossProfit 218,660us-gaap_GrossProfit 213,649us-gaap_GrossProfit
Selling, general and administrative expenses                 133,235us-gaap_SellingGeneralAndAdministrativeExpense 133,867us-gaap_SellingGeneralAndAdministrativeExpense 121,590us-gaap_SellingGeneralAndAdministrativeExpense
Gains on dispositions of plant, equipment and timberlands, net                 (4,861)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (1,726)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (9,815)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Operating income                 106,780us-gaap_OperatingIncomeLoss 86,519us-gaap_OperatingIncomeLoss 101,874us-gaap_OperatingIncomeLoss
Non-operating income (expense)                      
Interest expense                 (18,921)us-gaap_InterestExpense (17,965)us-gaap_InterestExpense (18,694)us-gaap_InterestExpense
Interest income                 159us-gaap_InvestmentIncomeInterest 310us-gaap_InvestmentIncomeInterest 460us-gaap_InvestmentIncomeInterest
Other, net                 (635)us-gaap_OtherNonoperatingIncomeExpense 337us-gaap_OtherNonoperatingIncomeExpense (4,699)us-gaap_OtherNonoperatingIncomeExpense
Total other expense                 (19,397)us-gaap_NonoperatingIncomeExpense (17,318)us-gaap_NonoperatingIncomeExpense (22,933)us-gaap_NonoperatingIncomeExpense
Income before income taxes                 87,383us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 69,201us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 78,941us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax provision                 18,137us-gaap_IncomeTaxExpenseBenefit 2,043us-gaap_IncomeTaxExpenseBenefit 19,562us-gaap_IncomeTaxExpenseBenefit
Net income                 $ 69,246us-gaap_NetIncomeLoss $ 67,158us-gaap_NetIncomeLoss $ 59,379us-gaap_NetIncomeLoss
Earnings per share                      
Basic                 $ 1.60us-gaap_EarningsPerShareBasic $ 1.56us-gaap_EarningsPerShareBasic $ 1.39us-gaap_EarningsPerShareBasic
Diluted $ 0.45us-gaap_EarningsPerShareDiluted $ 0.69us-gaap_EarningsPerShareDiluted $ 0.11us-gaap_EarningsPerShareDiluted $ 0.33us-gaap_EarningsPerShareDiluted $ 0.37us-gaap_EarningsPerShareDiluted $ 0.77us-gaap_EarningsPerShareDiluted $ 0.02us-gaap_EarningsPerShareDiluted $ 0.36us-gaap_EarningsPerShareDiluted $ 1.57us-gaap_EarningsPerShareDiluted $ 1.52us-gaap_EarningsPerShareDiluted $ 1.36us-gaap_EarningsPerShareDiluted
Cash dividends declared per common share                 $ 0.44us-gaap_CommonStockDividendsPerShareDeclared $ 0.40us-gaap_CommonStockDividendsPerShareDeclared $ 0.36us-gaap_CommonStockDividendsPerShareDeclared
Weighted average shares outstanding                      
Basic                 43,201us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 43,158us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 42,851us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted                 44,066us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 44,299us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 43,672us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding