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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Taxes    
Income tax provision (benefit) $ 1,335us-gaap_IncomeTaxExpenseBenefit $ (7,438)us-gaap_IncomeTaxExpenseBenefit
Pre-tax earnings (loss) 3,129us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (2,648)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Effective tax rate (as a percent) 42.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Effective tax rate before discrete benefits and true-up adjustments (as a percent)   280.90%stan_EffectiveIncomeTaxRateBeforeFederalIncomeTaxCredits
Discrete benefits for retroactive extension of tax credit programs   $ 6,359us-gaap_IncomeTaxReconciliationTaxCredits