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Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 459,936 us-gaap_StockholdersEquity | $ 307 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 236,673 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 229,437 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (3,350)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (3,131)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance, shares at Dec. 31, 2011 |  | 30,702,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 281,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net (loss) income | 12,645 us-gaap_NetIncomeLoss |  |  | 12,645 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Foreign currency translation adjustment | 2,353 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  | 2,353 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Adjustment to retirement benefit liability, net of tax | (79)rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 |  |  |  | (79)rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Adjustment to post-retirement healthcare benefit liability, net of taxes | (499)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax |  |  |  | (499)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Unrealized loss on cash flow hedges, net of tax | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |  |
Stock compensation expense | 3,148 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 3,148 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Excess tax benefit from stock compensation | 10 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 10 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net settlement of restricted stock units, shares |  | 197,000 rock_StockIssuedDuringPeriodSharesRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 69,000 rock_StockIssuedDuringPeriodSharesRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net settlement of restricted stock units | (970)rock_StockIssuedDuringPeriodValueRestrictedStockAwardSettlement | 2 rock_StockIssuedDuringPeriodValueRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (2)rock_StockIssuedDuringPeriodValueRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (970)rock_StockIssuedDuringPeriodValueRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Issuance of restricted stock, shares |  | 11,000 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock options exercised, shares | 27,500 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 28,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock options exercised | 278 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  | 278 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Balance at Dec. 31, 2012 | 476,822 us-gaap_StockholdersEquity | 309 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 240,107 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 242,082 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,575)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (4,101)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance, shares at Dec. 31, 2012 |  | 30,938,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 350,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net (loss) income | (5,633)us-gaap_NetIncomeLoss |  |  | (5,633)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Foreign currency translation adjustment | (2,108)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  | (2,108)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Adjustment to retirement benefit liability, net of tax | 53 rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 |  |  |  | 53 rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Adjustment to post-retirement healthcare benefit liability, net of taxes | 45 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax |  |  |  | 45 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Unrealized loss on cash flow hedges, net of tax | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |  |
Stock compensation expense | 2,564 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 2,564 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Excess tax benefit from stock compensation | 72 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 72 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net settlement of restricted stock units, shares |  | 120,000 rock_StockIssuedDuringPeriodSharesRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 45,000 rock_StockIssuedDuringPeriodSharesRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net settlement of restricted stock units | (714)rock_StockIssuedDuringPeriodValueRestrictedStockAwardSettlement | 2 rock_StockIssuedDuringPeriodValueRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (2)rock_StockIssuedDuringPeriodValueRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (714)rock_StockIssuedDuringPeriodValueRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Issuance of restricted stock, shares |  | 13,000 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock options exercised, shares | 59,750 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 60,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock options exercised | 648 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  | 648 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Balance at Dec. 31, 2013 | 471,749 us-gaap_StockholdersEquity | 311 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 243,389 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 236,449 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (3,585)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (4,815)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance, shares at Dec. 31, 2013 |  | 31,131,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 395,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net (loss) income | (81,824)us-gaap_NetIncomeLoss |  |  | (81,824)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Foreign currency translation adjustment | (4,364)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  | (4,364)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Adjustment to retirement benefit liability, net of tax | (24)rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 |  |  |  | (24)rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Adjustment to post-retirement healthcare benefit liability, net of taxes | (1,435)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax |  |  |  | (1,435)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Unrealized loss on cash flow hedges, net of tax | (143)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  | (143)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Stock compensation expense | 3,150 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 3,150 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Excess tax benefit from stock compensation | 100 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 100 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net settlement of restricted stock units, shares |  | 136,000 rock_StockIssuedDuringPeriodSharesRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 34,000 rock_StockIssuedDuringPeriodSharesRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net settlement of restricted stock units | (575)rock_StockIssuedDuringPeriodValueRestrictedStockAwardSettlement | 1 rock_StockIssuedDuringPeriodValueRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (1)rock_StockIssuedDuringPeriodValueRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (575)rock_StockIssuedDuringPeriodValueRestrictedStockAwardSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Issuance of restricted stock, shares |  | 22,000 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock options exercised, shares | 52,805 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 53,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock options exercised | 595 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 1 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 594 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Balance at Dec. 31, 2014 | $ 387,229 us-gaap_StockholdersEquity | $ 313 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 247,232 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 154,625 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (9,551)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (5,390)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance, shares at Dec. 31, 2014 |  | 31,342,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 429,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember

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