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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]    
Maximum annual contributions per employee, percent 10.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent  
Employer matching contribution, percent of match 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch  
Employer matching contribution, percent of employees' gross pay 4.00%smid_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPay  
Cost recognized $ 89us-gaap_DefinedContributionPlanCostRecognized $ 79us-gaap_DefinedContributionPlanCostRecognized