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Debt Part 2 (Details) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended | 12 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 JPMorgan Chase Bank, National Association USD ($) | Dec. 31, 2014 Amendment No. 1 to the 2011 Credit Agreement Effective April 25 , 2013 | Dec. 31, 2014 Prudential Investment Management, Inc. Private Shelf Agreement USD ($) | Dec. 31, 2014 Amended Prudential Investment Management USD ($) | Mar. 31, 2014 Series A Notes USD ($) | Dec. 31, 2014 Series A Notes USD ($) | Dec. 31, 2014 Series B Notes USD ($) | Dec. 31, 2014 Royal Bank of Scotland Citizens, N.A. USD ($) | Dec. 31, 2014 Royal Bank of Scotland Citizens, N.A. EUR (€) | Mar. 31, 2014 HSBC Bank (China) Company Limited, Shanghai Branch USD ($) | Dec. 31, 2014 HSBC Bank (China) Company Limited, Shanghai Branch USD ($)
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration date |  |  |  | May 05, 2016 | Mar. 01, 2018 |  | Jul. 24, 2015 |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | $ 125,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 187,500 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember |  | 80,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = tnc_PrudentialInvestmentManagementInc.PrivateShelfAgreementMember |  |  |  |  | 2,421 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = tnc_RoyalBankOfScotlandNvMember | 2,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = tnc_RoyalBankOfScotlandNvMember |  | 5,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = tnc_HsbcBankChinaCompanyLimitedShanghaiBranchMember
Additional borrowing capacity available |  |  |  | 62,500 tnc_LineOfCreditFacilityAdditionalBorrowingCapacityAvailable / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember |  |  |  |  |  |  |  |  |  |
Sublimit on borrowings by foreign subsidiaries |  |  |  | 100,000 tnc_LineOfCreditFacilityCapacityAvailableForForeignSubsidiaries / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember |  |  |  |  |  |  |  |  |  |
Minimum commitment fee percentage |  |  |  | 0.25%tnc_LineOfCreditFacilityMinimumCommitmentFeePercentage / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember | 0.20%tnc_LineOfCreditFacilityMinimumCommitmentFeePercentage / us-gaap_LineOfCreditFacilityAxis = tnc_AmendmentNo1To2011CreditAgreementEffectiveApril252013Member |  |  |  |  |  |  |  |  |
Maximum commitment fee percentage |  |  |  | 0.40%tnc_LineOfCreditFacilityMaximumCommitmentFeePercentage / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember | 0.35%tnc_LineOfCreditFacilityMaximumCommitmentFeePercentage / us-gaap_LineOfCreditFacilityAxis = tnc_AmendmentNo1To2011CreditAgreementEffectiveApril252013Member |  |  |  |  |  |  |  |  |
Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings |  |  |  | 1.50%tnc_MinimuminterestratespreadaddedtoadjustedLIBORratebasedonleverageratioonEurocurrencyborrowingsinhundreths / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember | 1.30%tnc_MinimuminterestratespreadaddedtoadjustedLIBORratebasedonleverageratioonEurocurrencyborrowingsinhundreths / us-gaap_LineOfCreditFacilityAxis = tnc_AmendmentNo1To2011CreditAgreementEffectiveApril252013Member |  |  |  |  |  |  |  |  |
Maximum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings |  |  |  | 2.10%tnc_MaximuminterestratespreadaddedtoadjustedLIBORratebasedonleveragerationonEurocurrencyborrowingsinhundreths / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember | 1.90%tnc_MaximuminterestratespreadaddedtoadjustedLIBORratebasedonleveragerationonEurocurrencyborrowingsinhundreths / us-gaap_LineOfCreditFacilityAxis = tnc_AmendmentNo1To2011CreditAgreementEffectiveApril252013Member |  |  |  |  |  |  |  |  |
Interest rate spread added to the federal funds rate on Alternate Base Rate borrowings |  |  |  | 0.50%tnc_LineOfCreditFacilityInterestRateMarginSpreadAddedToFederalFundsRate / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember | 0.50%tnc_LineOfCreditFacilityInterestRateMarginSpreadAddedToFederalFundsRate / us-gaap_LineOfCreditFacilityAxis = tnc_AmendmentNo1To2011CreditAgreementEffectiveApril252013Member |  |  |  |  |  |  |  |  |
Interest rate spread added to LIBOR rate for one month on Alternate Base Rate borrowings |  |  |  | 1.00%tnc_LineOfCreditFacilityInterestRateMarginSpreadAddedToLiborRate / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember | 1.00%tnc_LineOfCreditFacilityInterestRateMarginSpreadAddedToLiborRate / us-gaap_LineOfCreditFacilityAxis = tnc_AmendmentNo1To2011CreditAgreementEffectiveApril252013Member |  |  |  |  |  |  |  |  |
Minimum interest rate spread added to LIBOR rate on Alternate Base Rate borrowings |  |  |  | 0.50%tnc_LineOfCreditFacilityMinimumInterestRateMarginSpreadAddedToLiborRate / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember | 0.30%tnc_LineOfCreditFacilityMinimumInterestRateMarginSpreadAddedToLiborRate / us-gaap_LineOfCreditFacilityAxis = tnc_AmendmentNo1To2011CreditAgreementEffectiveApril252013Member |  |  |  |  |  |  |  |  |
Maximum interest rate spread added to LIBOR rate on Alternate Base Rate borrowings |  |  |  | 1.10%tnc_LineOfCreditFacilityMaximumInterestRateMarginSpreadAddedToLiborRate / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember | 0.90%tnc_LineOfCreditFacilityMaximumInterestRateMarginSpreadAddedToLiborRate / us-gaap_LineOfCreditFacilityAxis = tnc_AmendmentNo1To2011CreditAgreementEffectiveApril252013Member |  |  |  |  |  |  |  |  |
Percentage collateral in stock of certain subsidiaries |  |  |  | 65.00%tnc_LineOfCreditFacilityPercentageCollateralInStocks / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember |  |  |  |  |  |  |  |  |  |
Covenant restriction, Maximum indebtedness to EBITDA |  |  |  | 3.00 to 1 |  |  | 3.00 to 1 |  |  |  |  |  |  |
Covenant restriction, Minimum EBITDA to interest expense |  |  |  | 3.50 to 1 |  |  |  |  |  |  |  |  |  |
Covenant restriction, Maximum leverage after paying dividends or repuchasing stock |  |  |  | 2.00 to 1 |  |  | 2.00 to 1 |  |  |  |  |  |  |
Restriction on dividends and repurchases of common stock, Minimum |  |  |  | 50,000 tnc_LineOfCreditFacilityRestrictionOnDividendsAndRepurchasesOfCommonStockMinimum / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember |  | 12,000 tnc_LineOfCreditFacilityRestrictionOnDividendsAndRepurchasesOfCommonStockMinimum / us-gaap_LineOfCreditFacilityAxis = tnc_PrudentialInvestmentManagementInc.PrivateShelfAgreementMember | 50,000 tnc_LineOfCreditFacilityRestrictionOnDividendsAndRepurchasesOfCommonStockMinimum / us-gaap_LineOfCreditFacilityAxis = tnc_AmendedPrudentialInvestmentManagementMember |  |  |  |  |  |  |
Restriction on dividends and repurchases of common stock, Maximum |  |  |  | 75,000 tnc_LineOfCreditFacilityRestrictionOnDividendsAndRepurchasesOfCommonStockMaximum / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember |  | 40,000 tnc_LineOfCreditFacilityRestrictionOnDividendsAndRepurchasesOfCommonStockMaximum / us-gaap_LineOfCreditFacilityAxis = tnc_PrudentialInvestmentManagementInc.PrivateShelfAgreementMember | 75,000 tnc_LineOfCreditFacilityRestrictionOnDividendsAndRepurchasesOfCommonStockMaximum / us-gaap_LineOfCreditFacilityAxis = tnc_AmendedPrudentialInvestmentManagementMember |  |  |  |  |  |  |
Covenant restriction, Maximum leverage after acquisitions |  |  |  | 2.75 to 1 |  |  | 2.75 to 1 |  |  |  |  |  |  |
Covenant restriction, Maximum level that can be paid for acquisitions |  |  |  | 25,000 tnc_LineOfCreditFacilityCovenantRestrictionMaximumAcquisitionAmountWithHighLeverage / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember |  |  | 25,000 tnc_LineOfCreditFacilityCovenantRestrictionMaximumAcquisitionAmountWithHighLeverage / us-gaap_LineOfCreditFacilityAxis = tnc_AmendedPrudentialInvestmentManagementMember |  |  |  |  |  |  |
Weighted average interest rate at end of period |  |  |  | 1.46%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | 8,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = tnc_SeriesNotesMember | 10,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = tnc_SeriesBNotesMember |  |  |  |
Interest rate, Stated percentage |  |  |  |  |  |  |  |  | 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LineOfCreditFacilityAxis = tnc_SeriesNotesMember | 4.10%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LineOfCreditFacilityAxis = tnc_SeriesBNotesMember |  |  |  |
Payment Terms |  |  |  |  |  |  |  |  | seven-year | 10-year |  |  |  |
Maturity date range, Start |  |  |  |  |  |  |  |  | Mar. 11, 2014 | Jun. 01, 2015 |  |  |  |
Maturity date range, End |  |  |  |  |  |  |  |  | Mar. 11, 2018 | Jun. 01, 2021 |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  | 2,000 us-gaap_RepaymentsOfLongTermDebt / us-gaap_LineOfCreditFacilityAxis = tnc_SeriesNotesMember |  |  |  |  |  |
Payments of Short-term Debt | 1,500 us-gaap_RepaymentsOfShortTermDebt | 0 us-gaap_RepaymentsOfShortTermDebt | 0 us-gaap_RepaymentsOfShortTermDebt |  |  |  |  |  |  |  |  |  | 1,500 us-gaap_RepaymentsOfShortTermDebt / us-gaap_LineOfCreditFacilityAxis = tnc_HsbcBankChinaCompanyLimitedShanghaiBranchMember |
Outstanding Borrowings |  |  |  | $ 10,000 us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = tnc_JpmorganChaseBankNationalAssociationMember |  |  | $ 18,000 us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = tnc_AmendedPrudentialInvestmentManagementMember |  |  |  | $ 0 us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = tnc_RoyalBankOfScotlandNvMember |  |  | $ 0 us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = tnc_HsbcBankChinaCompanyLimitedShanghaiBranchMember

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- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for foreign subsidiaries of the entity. + References No definition available. + Details
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- Definition The maximum dollar amount that can be paid for an acquisition if leverage is above the maximum ratio as allowed under debt covenant. + References No definition available. + Details
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- Definition The maximum Line of credit facility restrictive covenant on indebtedness to EBITDA ratio. + References No definition available. + Details
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- Definition The maximum leverage ratio allowed under line of credit facility restrictive covenant after acquisitions. + References No definition available. + Details
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- Definition The maximum leverage ratio allowed under line of credit facility restrictive covenant after the effect of paying dividends or repurchasing the company's stock. + References No definition available. + Details
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- Definition The minimum Line of credit facility restrictive covenant on EBITDA to interest expense ratio. + References No definition available. + Details
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- Definition The amount of additional margin spread added to Federal Funds interest rate on Alternalte Base Rate ("ABR") borrowings. + References No definition available. + Details
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- Definition The maximum fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition The maximum amount of additional margin spread added to LIBOR one month interest rate on Alternate Base Rate borrowings. + References No definition available. + Details
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- Definition The minimum fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition The minimum amount of additional margin spread added to LIBOR one month interest rate on Alternate Base Rate borrowings. + References No definition available. + Details
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- Definition The percentage of all domestic and first tier foreign subsidiaries pledged as collateral under the credit agreement. + References No definition available. + Details
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- Definition The maximum restrictions on the entity's ability to pay dividends and repurchases of common stock based on the company's leverage ratio after giving effect to such payments. + References No definition available. + Details
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- Definition The minimum restrictions on the entity's ability to pay dividends and repurchases of common stock based on the company's leverage ratio after giving effect to such payments. + References No definition available. + Details
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- Definition Maximum interest rate spread added to adjusted LIBOR rate based on leverage ration on Eurocurrency borrowings (in hundreths). + References No definition available. + Details
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- Definition Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths). + References No definition available. + Details
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- Definition Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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