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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventories carried at LIFO:
Finished goods	$ 39,737	$ 36,238
Raw materials, production parts and work-in-process	14,984	13,922
LIFO Reserve	(27,463)	(27,463)
LIFO Inventory Amount	27,258	22,697
Inventories carried at FIFO:
Finished goods	33,401	31,489
Raw materials, production parts and work-in-process	13,179	12,720
Total FIFO inventories	46,580	44,209
Total Inventories	$ 73,838	$ 66,906

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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.

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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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