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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
Mar. 31, 2015
Cost  
Mature in one year or less $ 202us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Mature in more than three years 32,194sxcl_AvailableforsaleSecuritiesDebtMaturitiesMoreThanThreeYearsAmortizedCostBasis
Total debt securities 32,396us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis
Securities with no contractual maturities 147,126us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
Total 179,522us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Estimated Fair Value  
Mature in one year or less 207us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Mature in more than three years 30,629sxcl_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsFairValue
Total debt securities 30,836us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate
Securities with no contractual maturities 135,253us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
Total $ 166,089us-gaap_AvailableForSaleSecuritiesDebtSecurities