PROPERTY, PLANT, AND EQUIPMENT (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	$ 378,392,000	$ 367,218,000
Accumulated depreciation	(253,554,000)	(245,426,000)
Property, plant and equipment, net	124,838,000	121,792,000	122,219,000
Computer software costs included in construction in progress	4,700,000	2,600,000
Land and buildings
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	108,841,000	106,891,000
Machinery and equipment
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	257,665,000	248,704,000
Construction in progress
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	$ 11,886,000	$ 11,623,000

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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