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Debt and Capital Lease Obligations (Schedule of Future Minimum Lease Payments for Capital Leases) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Capital Leased Assets [Line Items]  
2015 $ 1,626us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
2016 589us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
Total minimum lease payments 2,215us-gaap_CapitalLeasesFutureMinimumPaymentsDue
Less interest at rates ranging from 5.21% to 5.46% (before-tax) 75us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
Net minimum lease payments 2,140us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
Less current portion 2,094us-gaap_CapitalLeaseObligationsCurrent
Total long-term capital lease obligation $ 46us-gaap_CapitalLeaseObligationsNoncurrent
Minimum [Member]  
Capital Leased Assets [Line Items]  
Capital lease, interest rate 5.21%swc_CapitalLeaseInterestRateImputed
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]  
Capital Leased Assets [Line Items]  
Capital lease, interest rate 5.46%swc_CapitalLeaseInterestRateImputed
/ us-gaap_RangeAxis
= us-gaap_MaximumMember