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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2011 | $ 657,994 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 875 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 196,626 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 902,987 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (115,282)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (327,212)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Beginning Balance (in shares) at Dec. 31, 2011 |  | 69,884,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 151,346 us-gaap_ProfitLoss |  |  | 151,346 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Other comprehensive income (loss) | 5,369 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 5,369 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Dividends declared on common stock | (33,790)us-gaap_DividendsCommonStockCash |  |  | (33,790)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Stock compensation expense | 7,208 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 7,208 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock option exercises (in shares) |  | 36,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock option exercises, including tax benefit | 775 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 1 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 774 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net issuance of treasury stock for vested restricted stock units (in shares) |  | 89,000 slgn_TreasuryStockIssuedDuringPeriodSharesForVestedRestrictedStockNet / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net issuance of treasury stock for vested restricted stock units, including tax benefit | (1,150)slgn_TreasuryStockIssuedDuringPeriodValueForVestedRestrictedStockNet |  | (159)slgn_TreasuryStockIssuedDuringPeriodValueForVestedRestrictedStockNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (991)slgn_TreasuryStockIssuedDuringPeriodValueForVestedRestrictedStockNet / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Repurchases of common stock (in shares) | (805,346)us-gaap_TreasuryStockSharesAcquired | (805,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Repurchases of common stock | (34,109)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (34,109)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending Balance at Dec. 31, 2012 | 753,643 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 876 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 204,449 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,020,543 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (109,913)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (362,312)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending Balance (in shares) at Dec. 31, 2012 |  | 69,204,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 185,413 us-gaap_ProfitLoss |  |  | 185,413 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Other comprehensive income (loss) | 71,794 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 71,794 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Dividends declared on common stock | (36,202)us-gaap_DividendsCommonStockCash |  |  | (36,202)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Stock compensation expense | 8,902 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 8,902 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net issuance of treasury stock for vested restricted stock units (in shares) |  | 90,000 slgn_TreasuryStockIssuedDuringPeriodSharesForVestedRestrictedStockNet / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net issuance of treasury stock for vested restricted stock units, including tax benefit | (2,100)slgn_TreasuryStockIssuedDuringPeriodValueForVestedRestrictedStockNet |  | (529)slgn_TreasuryStockIssuedDuringPeriodValueForVestedRestrictedStockNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (1,571)slgn_TreasuryStockIssuedDuringPeriodValueForVestedRestrictedStockNet / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Repurchases of common stock (in shares) | (354,154)us-gaap_TreasuryStockSharesAcquired | (5,879,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Repurchases of common stock | (267,607)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (267,607)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending Balance at Dec. 31, 2013 | 713,843 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 876 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 212,822 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,169,754 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (38,119)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (631,490)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending Balance (in shares) at Dec. 31, 2013 | 63,415,444 us-gaap_CommonStockSharesOutstanding | 63,415,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 182,391 us-gaap_ProfitLoss |  |  | 182,391 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Other comprehensive income (loss) | (127,505)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | (127,505)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Dividends declared on common stock | (38,624)us-gaap_DividendsCommonStockCash |  |  | (38,624)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Stock compensation expense | 12,718 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 12,718 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net issuance of treasury stock for vested restricted stock units (in shares) |  | 297,000 slgn_TreasuryStockIssuedDuringPeriodSharesForVestedRestrictedStockNet / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net issuance of treasury stock for vested restricted stock units, including tax benefit | (8,201)slgn_TreasuryStockIssuedDuringPeriodValueForVestedRestrictedStockNet |  | (91)slgn_TreasuryStockIssuedDuringPeriodValueForVestedRestrictedStockNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (8,110)slgn_TreasuryStockIssuedDuringPeriodValueForVestedRestrictedStockNet / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Repurchases of common stock (in shares) | (508,667)us-gaap_TreasuryStockSharesAcquired | (509,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Repurchases of common stock | (24,666)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (24,666)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending Balance at Dec. 31, 2014 | $ 709,956 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 876 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 225,449 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,313,521 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (165,624)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (664,266)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending Balance (in shares) at Dec. 31, 2014 | 63,203,361 us-gaap_CommonStockSharesOutstanding | 63,203,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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