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Operations and Summary of Significant Accounting Policies - Comprehensive Income (Loss) - (Details) (USD $) | 3 Months Ended | 12 Months Ended
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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 bank | Dec. 31, 2013 | Dec. 31, 2012
Risks and Uncertainties [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of banks where demand deposit or money market accounts are held by the company |  |  |  |  |  |  |  |  | 15 ssd_NumberOfBanksWhereDemandDepositOrMoneyMarketAccountsAreHeldByCompany |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | $ 18,086,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |  | $ 12,099,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | $ 18,086,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | $ 12,099,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | $ 6,783,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | (25,266,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 3,193,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 5,316,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Amounts reclassified from accumulative other comprehensive income, net of tax |  |  |  |  |  |  |  |  |  | 2,794,000 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |
Balance, end of period | (7,180,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |  | 18,086,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |  | (7,180,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 18,086,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 12,099,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Translation Adjustment Functional to Reporting Currency, Net of Tax |  |  |  |  | 2,800,000 us-gaap_TranslationAdjustmentFunctionalToReportingCurrencyNetOfTax |  |  |  |  | 2,800,000 us-gaap_TranslationAdjustmentFunctionalToReportingCurrencyNetOfTax |
Provision for income taxes | 4,942,000 us-gaap_IncomeTaxExpenseBenefit | 11,577,000 us-gaap_IncomeTaxExpenseBenefit | 11,667,000 us-gaap_IncomeTaxExpenseBenefit | 7,605,000 us-gaap_IncomeTaxExpenseBenefit | 4,290,000 us-gaap_IncomeTaxExpenseBenefit | 10,870,000 us-gaap_IncomeTaxExpenseBenefit | 11,177,000 us-gaap_IncomeTaxExpenseBenefit | 4,256,000 us-gaap_IncomeTaxExpenseBenefit | 35,791,000 us-gaap_IncomeTaxExpenseBenefit | 30,593,000 us-gaap_IncomeTaxExpenseBenefit | 20,003,000 us-gaap_IncomeTaxExpenseBenefit
Foreign currency translation |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | 18,283,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |  | 12,342,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 18,283,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 12,342,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 6,783,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | (24,896,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 3,147,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 5,559,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember
Amounts reclassified from accumulative other comprehensive income, net of tax |  |  |  |  |  |  |  |  |  | 2,794,000 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Balance, end of period | (6,613,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |  | 18,283,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |  | (6,613,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 18,283,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 12,342,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember
Tax expense (benefit) |  |  |  |  |  |  |  |  | 63,000 us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | (29,000)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 33,000 us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember
Foreign currency translation | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Pension benefit |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | (197,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  | (243,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (197,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (243,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 0 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | (370,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 46,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (243,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Amounts reclassified from accumulative other comprehensive income, net of tax |  |  |  |  |  |  |  |  |  |  |
Balance, end of period | (567,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  | (197,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  | (567,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (197,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (243,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Tax expense (benefit) |  |  |  |  |  |  |  |  | (67,000)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 3,000 us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 46,000 us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Pension benefit | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  |  |  |  |  |  |  | $ 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |

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