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Investments Amortized Cost and Estimated Fair Value of Investments in Available-for-sale Securities, by Contractual Maturity (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Cost  
Mature in one year or less $ 212us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Mature after one year through three years 0sxcl_AvailableforsaleSecuritiesDebtMaturitiesYearOneThroughThreeAmortizedCostBasis
Mature in more than three years 32,274sxcl_AvailableforsaleSecuritiesDebtMaturitiesMoreThanThreeYearsAmortizedCostBasis
Total debt securities 32,486us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis
Securities with no contractual maturities 163,472us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
Total 195,958us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Estimated Fair Value  
Mature in one year or less 186us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Mature after one year through three years 0sxcl_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue
Mature in more than three years 29,451sxcl_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsFairValue
Total debt securities 29,637us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate
Securities with no contractual maturities 151,501us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
Total $ 181,138us-gaap_AvailableForSaleSecuritiesDebtSecurities