Property, plant and equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, plant and equipment
Total property, plant and equipment	$ 48,820	$ 47,860
Less accumulated depreciation	(28,933)	(26,520)
Net property, plant and equipment	19,887	21,340
Land
Property, plant and equipment
Total property, plant and equipment	960	960
Land improvements
Property, plant and equipment
Total property, plant and equipment	1,768	1,768
Buildings
Property, plant and equipment
Total property, plant and equipment	12,852	12,660
Machinery and equipment
Property, plant and equipment
Total property, plant and equipment	24,286	23,253
Furniture and fixtures
Property, plant and equipment
Total property, plant and equipment	7,465	7,255
Mobile equipment and other
Property, plant and equipment
Total property, plant and equipment	1,138	1,216
Construction-in-process
Property, plant and equipment
Total property, plant and equipment	$ 351	$ 748

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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