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

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Carrying amount as of the balance sheet date of merchandise or goods (FIFO) held by the company that are readily available for sale.

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The aggregate gross carrying amount as of the balance sheet date of merchandise or goods (LIFO) held by the company that are readily available for sale.

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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.

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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.

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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

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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.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

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