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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Goodwill, Gross |  |  |
Balance, beginning of period | $ 64,858 us-gaap_GoodwillGross |  |
Foreign currency fluctuations | (3,492)us-gaap_GoodwillTranslationAdjustments |  |
Balance, end of period | 61,366 us-gaap_GoodwillGross |  |
Accumulated Impairment Losses |  |  |
Balance, beginning of period | (46,503)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  |
Foreign currency fluctuations | 2,694 tnc_ImpairmentLossesForeignCurrencyFluctuations |  |
Balance, end of period | (43,809)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  |
Goodwill, Net |  |  |
Balance, beginning of period | 18,355 us-gaap_Goodwill |  |
Foreign currency fluctuations | (798)tnc_GoodwillNetForeignCurrencyFluctuations |  |
Balance, end of period | 17,557 us-gaap_Goodwill |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | 30,698 us-gaap_FiniteLivedIntangibleAssetsGross |  | 33,161 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated amortization | (16,477)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | (17,573)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible Assets, Net | 14,221 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 15,588 us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortization expense | 520 us-gaap_AmortizationOfIntangibleAssets | 611 us-gaap_AmortizationOfIntangibleAssets |
Estimated aggregate amortization expense of Intangible Assets |  |  |
Remaining 2015 | 1,390 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |  |
2016 | 1,639 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |
2017 | 1,542 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |
2018 | 1,536 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |
2019 | 1,428 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |
Thereafter | 6,686 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  |
Total | 14,221 us-gaap_FiniteLivedIntangibleAssetsNet |  |
Customer Lists |  |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | 20,324 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  | 21,946 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Accumulated amortization | (11,356)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  | (12,099)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Intangible Assets, Net | 8,968 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  | 9,847 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Weighted-average original life | 15 years |  | 15 years
Trade Name |  |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | 3,812 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  | 4,300 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Accumulated amortization | (1,903)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  | (2,068)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Intangible Assets, Net | 1,909 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  | 2,232 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Weighted-average original life | 14 years |  | 14 years
Technology |  |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | 6,562 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember |  | 6,915 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Accumulated amortization | (3,218)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember |  | (3,406)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Intangible Assets, Net | $ 3,344 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember |  | $ 3,509 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Weighted-average original life | 13 years |  | 13 years

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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