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DEBT (Details)
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 2 Months Ended 0 Months Ended 2 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2014
Uncommitted Loans [Member]
USD ($)
Dec. 31, 2013
Uncommitted Loans [Member]
USD ($)
Dec. 31, 2014
Loans of foreign subsidiaries [Member]
USD ($)
Dec. 31, 2013
Loans of foreign subsidiaries [Member]
USD ($)
Dec. 31, 2014
Euro Denominated Senior Notes Due November2023 at 3.06 Percent [Member]
USD ($)
Dec. 31, 2014
Euro Denominated Senior Notes Due November2023 at 3.06 Percent [Member]
EUR (€)
Dec. 31, 2013
Euro Denominated Senior Notes Due November2023 at 3.06 Percent [Member]
USD ($)
Dec. 31, 2013
Euro Denominated Senior Notes Due November2023 at 3.06 Percent [Member]
EUR (€)
Dec. 31, 2014
Senior Notes Due November 2023 at 3.66 Percent [Member]
USD ($)
Dec. 31, 2013
Senior Notes Due November 2023 at 3.66 Percent [Member]
USD ($)
Dec. 31, 2014
Senior Notes Due November 2018 at 4.47 percent [Member]
USD ($)
Dec. 31, 2013
Senior Notes Due November 2018 at 4.47 percent [Member]
USD ($)
Dec. 31, 2014
Senior Notes Due November 2017 at 4.14 percent [Member]
USD ($)
Dec. 31, 2013
Senior Notes Due November 2017 at 4.14 percent [Member]
USD ($)
Dec. 31, 2014
Senior Notes Due Through May 2017 at 4.91 Percent [Member]
USD ($)
Dec. 31, 2013
Senior Notes Due Through May 2017 at 4.91 Percent [Member]
USD ($)
Dec. 31, 2014
Senior Notes Due November 2016 at 3.77 Percent [Member]
USD ($)
Dec. 31, 2013
Senior Notes Due November 2016 at 3.77 Percent [Member]
USD ($)
Dec. 31, 2014
Long-term Debt [Member]
USD ($)
Dec. 31, 2013
Long-term Debt [Member]
USD ($)
Dec. 31, 2014
Various Other Notes [Member]
USD ($)
Dec. 31, 2013
Various Other Notes [Member]
USD ($)
Dec. 31, 2014
Term Loan [Member]
USD ($)
Dec. 31, 2014
Term Loan [Member]
LIBOR [Member]
Oct. 24, 2014
Revolver [Member]
Dec. 31, 2014
Revolver [Member]
USD ($)
Dec. 31, 2014
Revolver [Member]
LIBOR [Member]
Dec. 31, 2014
Line of Credit [Member]
USD ($)
Dec. 31, 2013
Line of Credit [Member]
USD ($)
Schedule of long term debt [Abstract]                                                              
Long-term debt, gross $ 451,011,000us-gaap_LongTermDebt $ 348,124,000us-gaap_LongTermDebt         $ 46,270,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_EuroDenominatedSeniorNotesDueNovember2023At306PercentMember
€ 38,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_EuroDenominatedSeniorNotesDueNovember2023At306PercentMember
$ 52,566,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_EuroDenominatedSeniorNotesDueNovember2023At306PercentMember
€ 38,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_EuroDenominatedSeniorNotesDueNovember2023At306PercentMember
$ 75,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueNovember2023At366PercentMember
$ 75,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueNovember2023At366PercentMember
$ 25,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueNovember2018Member
$ 25,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueNovember2018Member
$ 25,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueNovember2017Member
$ 25,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueNovember2017Member
$ 88,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueThroughMay2017Member
$ 99,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueThroughMay2017Member
$ 25,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueNovember2016Member
$ 25,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueNovember2016Member
$ 98,750,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_LongTermDebtMember
$ 0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_LongTermDebtMember
$ 2,004,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_VariousOtherNotesMember
$ 2,576,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sxt_VariousOtherNotesMember
          $ 65,987,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
$ 43,982,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
Less current maturities 0us-gaap_LongTermDebtCurrent 0us-gaap_LongTermDebtCurrent                                                          
Long-term debt, net 451,011,000us-gaap_LongTermDebtNoncurrent 348,124,000us-gaap_LongTermDebtNoncurrent                                                          
Interest rate, stated percentage             3.06%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sxt_EuroDenominatedSeniorNotesDueNovember2023At306PercentMember
3.06%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sxt_EuroDenominatedSeniorNotesDueNovember2023At306PercentMember
    3.66%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueNovember2023At366PercentMember
  4.47%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueNovember2018Member
  4.14%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueNovember2017Member
  4.91%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueThroughMay2017Member
  3.77%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sxt_SeniorNotesDueNovember2016Member
                       
Maturity date                                                     Oct. 24, 2019        
Term loan, maturity date             Nov. 30, 2023 Nov. 30, 2023     Nov. 30, 2023   Nov. 30, 2018   Nov. 30, 2017   May 31, 2017   Nov. 30, 2016           Oct. 24, 2019            
Term loan, face amount                                                 100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sxt_TermLoanMember
           
Interest rate, description                                                   LIBOR Plus 1.375%     LIBOR Plus 1.375%    
Interest rate (in hundredths)                                                   1.375%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= sxt_TermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
    1.375%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Credit facility, amount                                                       350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
  450,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
 
Long term debt additional disclosures [Abstract]                                                              
Average effective interest rate (in hundredths)                                                           1.54%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
1.54%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
Remaining borrowing capacity                                                       277,700,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
  41,800,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
 
Aggregate amounts of contractual maturities of long-term debt for the next five years [Abstract]                                                              
Amounts due in 2015 18,400,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths                                                            
Amounts due in 2016 43,800,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo                                                            
Amounts due in 2017 99,100,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree                                                            
Amounts due in 2018 35,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour                                                            
Amounts due in 2019 133,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive                                                            
Debt covenants [Abstract]                                                              
Debt to EBITDA (Maximum), Actual 1.74sxt_DebtToEbitdaMaximumActual                                                            
Net Worth (Minimum), Actual 1,046,935,000us-gaap_StockholdersEquity 1,242,684,000us-gaap_StockholdersEquity                                                          
Interest Coverage (Minimum), Actual 8.64sxt_InterestCoverageMinimumActual                                                            
Debt to EBITDA (Maximum), Required 3.50sxt_DebtToEbitdaMaximumRequired                                                            
Net Worth (Minimum), Required 625,000,000us-gaap_MinimumNetWorthRequiredForCompliance                                                            
Interest Coverage (Minimum), Required 2.0sxt_InterestCoverageMinimumRequired                                                            
Stand-by letters of credit outstanding 6,300,000us-gaap_LettersOfCreditOutstandingAmount 6,300,000us-gaap_LettersOfCreditOutstandingAmount                                                          
Short-term borrowings [Abstract]                                                              
Short-term borrowings $ 15,888,000us-gaap_ShortTermBorrowings $ 7,050,000us-gaap_ShortTermBorrowings $ 14,086,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
$ 4,600,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
$ 1,802,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LoansPayableMember
$ 2,450,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LoansPayableMember
                                                 
Weighted-average interest rates on short-term borrowings (in hundredths) 1.66%us-gaap_ShortTermDebtWeightedAverageInterestRate 2.16%us-gaap_ShortTermDebtWeightedAverageInterestRate