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Inventories (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Inventories carried at LIFO: |  |
Finished goods | $ 41,687 tnc_InventoryFinishedGoodsLifo | $ 36,238 tnc_InventoryFinishedGoodsLifo
Raw materials, production parts and work-in-process | 24,458 tnc_InventoryRawMaterialsProductionPartsAndWorkInProcessLifo | 13,922 tnc_InventoryRawMaterialsProductionPartsAndWorkInProcessLifo
LIFO Reserve | (28,166)us-gaap_InventoryLIFOReserve | (27,463)us-gaap_InventoryLIFOReserve
Total LIFO inventories | 37,979 us-gaap_LIFOInventoryAmount | 22,697 us-gaap_LIFOInventoryAmount
Inventories carried at FIFO: |  |
Finished goods | 29,851 tnc_InventoryFinishedGoodsFifo | 31,489 tnc_InventoryFinishedGoodsFifo
Raw materials, production parts and work-in-process | 12,681 tnc_InventoryRawMaterialsProductionPartsAndWorkInProcessFifo | 12,720 tnc_InventoryRawMaterialsProductionPartsAndWorkInProcessFifo
Total FIFO inventories | 42,532 us-gaap_FIFOInventoryAmount | 44,209 us-gaap_FIFOInventoryAmount
Inventories | $ 80,511 us-gaap_InventoryNet | $ 66,906 us-gaap_InventoryNet

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- Definition Carrying amount as of the balance sheet date of merchandise or goods (FIFO) held by the company that are readily available for sale. + References No definition available. + Details
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- Definition The aggregate carrying amount (FIFO) as of the balance sheet date of items held by the entity which are partially completed at the time of measurement and unprocessed items that will go through the production process and become part of the final product. + References No definition available. + Details
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- Definition The aggregate gross carrying amount (LIFO) as of the balance sheet date of items held by the entity which are partially completed at the time of measurement and unprocessed items that will go through the production process and become part of the final product. + References No definition available. + Details
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- Definition The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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- Definition Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost. + 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 210.5-02.6(c)) -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 6 -Subparagraph c -Article 5 + Details
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