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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) | 60,000,000 us-gaap_CommonStockSharesAuthorized | 60,000,000 us-gaap_CommonStockSharesAuthorized |
Common Stock, par value (in dollars per share) | $ 0.375 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.375 us-gaap_CommonStockParOrStatedValuePerShare |
Preferred Stock, authorized (in shares) | 1,000,000 us-gaap_PreferredStockSharesAuthorized | 1,000,000 us-gaap_PreferredStockSharesAuthorized |
Preferred Stock, par value (in dollars per share) | $ 0.02 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.02 us-gaap_PreferredStockParOrStatedValuePerShare |
Class of Warrant or Right |  |  |
Number of shares authorized for issue | 61,000,000 tnc_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) | 1.00 tnc_PreferredSharePurchaseRightDividendDeclared / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_RightsMember |  |
Exercise price per each Series A Junior Participating Preferred Stock (in dollars per share) | $ 100 tnc_ExercisePricePerEachSeriesJuniorParticipatingPreferredStock / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_RightsMember |  |
Number of Series A Junior Participating Preferred shares the Rights holder is entitled to purchase (in shares) | 0.01 tnc_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 | $ 0.001 tnc_RedemptionPricePerRight / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_RightsMember |  |
Minimum threshold of common stock ownership | 10.00%tnc_MinimumThresholdOfCommonStockOwnership / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_RightsMember |  |

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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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