Property, Plant and Equipment (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Components of property, plant and equipment
Land	$ 15,402	$ 15,424	$ 15,427
Land improvements and leasehold improvements	45,753	45,080	44,230
Buildings and storage facilities	144,834	141,349	137,652
Machinery and equipment	188,552	181,650	173,890
Software	10,873	10,306	10,224
Construction in progress	17,323	2,572	7,224
Property, plant and equipment, gross	422,737	396,381	388,647
Less accumulated depreciation and amortization	257,844	245,349	241,463
Property, plant and equipment, net	$ 164,893	$ 151,032	$ 147,184

Land improvements and leasehold improvements, gross.

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- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

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-Paragraph 5

-Subparagraph c

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Number 210

-Section 02

-Paragraph 14

-Article 5

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Carrying amount as of the balance sheet date of long-lived, depreciable assets that include building structures held for productive use including any addition, improvement, or renovation to the structure, such as interior masonry, interior flooring, electrical, and plumbing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Carrying amount at the balance sheet date of long-lived asset under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Gross carrying amount before accumulated amortization as of the balance sheet date of capitalized costs to ready software for sale or licensing, or for long-term internal use.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 45

-Subparagraph a

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Carrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale.

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- Definition

Carrying amount as of the balance sheet date of long-lived, depreciable asset used in production process to produce goods and services.

+ References

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-Publisher AICPA

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Carrying amount at the balance sheet date for long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, physical structures, machinery, vehicles, furniture, computer equipment, construction in progress, and similar items. Amount does not include depreciation.

+ References

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Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, and production equipment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Paragraph 13

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