Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Inventory
Raw materials	$ 133,797,000	$ 128,606,000
Work-in-progress	39,617,000	26,762,000
Finished goods	56,653,000	54,425,000
Inventory, Net, Total	230,067,000us-gaap_InventoryNet	209,793,000us-gaap_InventoryNet
Goodwill
Long-term growth rate used to calculate terminal values for each reporting unit (as a percent)	3.00%
Investments
Fair value of equity security investments	$ 2,800,000	$ 3,200,000

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Represents the growth rate used to calculate terminal values for each reporting unit using a Gordon Growth methodology.

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Fair value portion of investments accounted under the equity method.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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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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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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