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Shareholders' Equity Part 1 (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stockholders' Equity Note [Abstract]      
Common Stock, authorized (in shares) 60,000,000us-gaap_CommonStockSharesAuthorized 60,000,000us-gaap_CommonStockSharesAuthorized  
Common Stock, par value (in dollars per share) $ 0.375us-gaap_CommonStockParOrStatedValuePerShare $ 0.375us-gaap_CommonStockParOrStatedValuePerShare  
Preferred Stock, authorized (in shares) 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized  
Preferred Stock, par value (in dollars per share) $ 0.02us-gaap_PreferredStockParOrStatedValuePerShare $ 0.02us-gaap_PreferredStockParOrStatedValuePerShare  
Class of Warrant or Right      
Number of shares authorized for issue 61,000,000tnc_NumberOfSharesAuthorizedForIssue    
Preferred Share purchase rights expiration date Dec. 26, 2016    
Accumulated Other Comprehensive Loss, Net of Tax      
Foreign Currency Translation Adjustments $ (32,090)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax $ (21,991)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax $ (19,734)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Pension and retiree medical benefits (6,503)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (2,980)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (10,599)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Accumulated Other Comprehensive Loss $ (38,593)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (24,971)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (30,333)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Purchase Rights      
Class of Warrant or Right      
Preferred Share purchase right dividend declared per common share outstanding (in shares) 1.00tnc_PreferredSharePurchaseRightDividendDeclared
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_RightsMember		    
Exercise price per each Series A Junior Participating Preferred Stock (in dollars per share) $ 100tnc_ExercisePricePerEachSeriesJuniorParticipatingPreferredStock
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_RightsMember		    
Number of Series A Junior Participating Preferred shares the Rights holder is entitled to purchase (in shares) 0.01tnc_NumberOfSharesRightsHolderEntitledToPurchase
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_RightsMember		    
Maximum threshold of common stock ownership 20.00%tnc_MaximumThresholdOfCommonStockOwnership
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_RightsMember		    
Redemption price per right $ 0.001tnc_RedemptionPricePerRight
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_RightsMember		    
Minimum threshold of common stock ownership 10.00%tnc_MinimumThresholdOfCommonStockOwnership
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_RightsMember