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Basis of Presentation (Details 4) (USD $) In Thousands, except Share data in Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Stock-based compensation activity, including both continuing and discontinued operations |  |  |
Stock-based compensation expense recognized in operating expenses | $ 3,084 us-gaap_AllocatedShareBasedCompensationExpense | $ 2,476 us-gaap_AllocatedShareBasedCompensationExpense |
Less: Tax benefit of stock-based compensation expense in provision for income taxes | 1,052 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 910 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |
Stock-based compensation expense, net of tax | 2,032 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | 1,566 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax |
Fair value of shares vested | 2,784 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 | 2,379 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 |
Proceeds to the Company from the exercise of stock-based compensation | 5,484 us-gaap_ProceedsFromStockOptionsExercised | 1,769 us-gaap_ProceedsFromStockOptionsExercised |
Tax effect from the exercise of stock-based compensation, including shortfall tax benefits | (184)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions | (135)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions |
Fair value of financial instruments |  |  |
United States Treasury securities and money market funds included in cash equivalents | 91,569 ssd_USTreasurySecuritiesAndMoneyMarketFundsFairValueDisclosure | 99,235 ssd_USTreasurySecuritiesAndMoneyMarketFundsFairValueDisclosure | 99,024 ssd_USTreasurySecuritiesAndMoneyMarketFundsFairValueDisclosure
Income Taxes |  |  |
Effective tax rate (as a percent) | 38.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 38.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations |
Provision for income taxes | 6,191 us-gaap_IncomeTaxExpenseBenefit | 7,604 us-gaap_IncomeTaxExpenseBenefit |
Stock Compensation Plan |  |  |
Stock-based compensation activity, including both continuing and discontinued operations |  |  |
Stock-based compensation cost capitalized in inventory | $ 276 us-gaap_OtherInventoryCapitalizedCosts / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember | $ 459 us-gaap_OtherInventoryCapitalizedCosts / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
1994 Plan |  |  |
Stock-Based Compensation |  |  |
Requisite service period for options to vest | 4 years |  |
Expiration period for options granted | 7 years |  |
Age after which vesting of options granted accelerates if the grantee ceases to be employed by the entity | 60 years |  |
2011 Plan |  |  |
Stock-Based Compensation |  |  |
Maximum common stock shares that may be issued under plan | 16.3 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = ssd_StockOptionAndRestrictedStockUnitPlan2011Member |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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