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Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data | Common Stock [Member] | Additional Paid-in Capital [Member] | Earnings Reinvested in the Business [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Total
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Beginning Balance at Dec. 31, 2011 | $ 5,396 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 94,187 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,069,610 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (80,935)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (39,048)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Beginning Balance (in shares) at Dec. 31, 2011 |  |  |  | 4,038,011 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Net earnings |  |  | 123,908 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 123,908 us-gaap_NetIncomeLoss
Other comprehensive income |  |  |  |  | 34,463 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Cash dividends paid |  |  | (43,426)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Share-based compensation |  | 10,086 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Stock options exercised |  | 52 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 1,438 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Stock options exercised (in shares) |  |  |  | (66,579)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Non-vested stock issued upon vesting |  | (6,999)sxt_NonvestedStockIssuedUponVesting / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 6,999 sxt_NonvestedStockIssuedUponVesting / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Non-vested stock issued upon vesting (in shares) |  |  |  | (313,812)sxt_NonvestedStockIssuedUponVestingShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Benefit plans |  | 388 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 480 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Benefit plans (in shares) |  |  |  | (22,925)us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Purchase of treasury stock |  |  |  | (23,154)sxt_TreasuryStockValueAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Purchase of treasury stock (in shares) |  |  |  | 626,251 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Other |  | 539 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (86)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Other (in shares) |  |  |  | 3,875 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Ending Balance at Dec. 31, 2012 | 5,396 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 98,253 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,150,092 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (95,258)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (4,585)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Ending Balance (in shares) at Dec. 31, 2012 |  |  |  | 4,264,821 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Net earnings |  |  | 113,295 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 113,295 us-gaap_NetIncomeLoss
Other comprehensive income |  |  |  |  | 10,587 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Cash dividends paid |  |  | (45,513)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Share-based compensation |  | 8,430 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Stock options exercised |  | (63)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 1,063 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Stock options exercised (in shares) |  |  |  | (47,584)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Non-vested stock issued upon vesting |  | (2,113)sxt_NonvestedStockIssuedUponVesting / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 2,113 sxt_NonvestedStockIssuedUponVesting / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Non-vested stock issued upon vesting (in shares) |  |  |  | (94,600)sxt_NonvestedStockIssuedUponVestingShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Benefit plans |  | 385 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 595 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Benefit plans (in shares) |  |  |  | (26,635)us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Other |  | 227 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (220)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Other (in shares) |  |  |  | 9,825 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Ending Balance at Dec. 31, 2013 | 5,396 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 105,119 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,217,874 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (91,707)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 6,002 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1,242,684 us-gaap_StockholdersEquity
Ending Balance (in shares) at Dec. 31, 2013 |  |  |  | 4,105,827 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Net earnings |  |  | 73,646 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 73,646 us-gaap_NetIncomeLoss
Other comprehensive income |  |  |  |  | (91,130)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Cash dividends paid |  |  | (47,893)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Share-based compensation |  | 6,265 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Stock options exercised |  | (161)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 753 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Stock options exercised (in shares) |  |  |  | (27,001)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Non-vested stock issued upon vesting |  | (1,206)sxt_NonvestedStockIssuedUponVesting / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 1,206 sxt_NonvestedStockIssuedUponVesting / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Non-vested stock issued upon vesting (in shares) |  |  |  | (40,300)sxt_NonvestedStockIssuedUponVestingShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Benefit plans |  | 510 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 406 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Benefit plans (in shares) |  |  |  | (18,185)us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Purchase of treasury stock |  |  |  | (138,288)sxt_TreasuryStockValueAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Purchase of treasury stock (in shares) |  |  |  | 2,500,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Other |  | 442 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (299)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Other (in shares) |  |  |  | 9,550 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Ending Balance at Dec. 31, 2014 | $ 5,396 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 110,969 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,243,627 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (227,929)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (85,128)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 1,046,935 us-gaap_StockholdersEquity
Ending Balance (in shares) at Dec. 31, 2014 |  |  |  | 6,529,891 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |

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