Property, Plant & Equipment (Details) (USD $)	3 Months Ended
Mar. 31, 2012	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 101,960,000	$ 99,747,000
Accumulated depreciation		(49,403,000)	(48,189,000)
Property, plant and equipment — net		52,557,000	51,558,000
Capital expenditures in progress		796,000	454,000
Capitalized interest expense	17,000
Commitments for capital expenditures in progress		$ 7,160,000	$ 662,000

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.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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