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Trade Accounts Receivable, net (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Trade accounts receivable $ 95,033us-gaap_AccountsReceivableGrossCurrent $ 92,413us-gaap_AccountsReceivableGrossCurrent
Allowance for doubtful accounts (929)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (945)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Allowance for sales discounts (2,089)ssd_AllowanceForSalesDiscountAndReturnsCurrent (1,451)ssd_AllowanceForSalesDiscountAndReturnsCurrent
Trade accounts receivable, net $ 92,015us-gaap_AccountsReceivableNetCurrent $ 90,017us-gaap_AccountsReceivableNetCurrent