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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventories carried at LIFO:
Finished goods	$ 45,589tnc_InventoryFinishedGoodsLifo	$ 41,687tnc_InventoryFinishedGoodsLifo
Raw materials, production parts and work-in-process	26,113tnc_InventoryRawMaterialsProductionPartsAndWorkInProcessLifo	24,458tnc_InventoryRawMaterialsProductionPartsAndWorkInProcessLifo
LIFO Reserve	(28,166)us-gaap_InventoryLIFOReserve	(28,166)us-gaap_InventoryLIFOReserve
LIFO Inventory Amount	43,536us-gaap_LIFOInventoryAmount	37,979us-gaap_LIFOInventoryAmount
Inventories carried at FIFO:
Finished goods	29,685tnc_InventoryFinishedGoodsFifo	29,851tnc_InventoryFinishedGoodsFifo
Raw materials, production parts and work-in-process	12,390tnc_InventoryRawMaterialsProductionPartsAndWorkInProcessFifo	12,681tnc_InventoryRawMaterialsProductionPartsAndWorkInProcessFifo
Total FIFO inventories	42,075us-gaap_FIFOInventoryAmount	42,532us-gaap_FIFOInventoryAmount
Total Inventories	$ 85,611us-gaap_InventoryNet	$ 80,511us-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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No definition available.

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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

-Topic 210

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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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