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SEGMENT AND GEOGRAPHIC REGION INFORMATION (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Sales to clients attributed to the geographic areas based on the origin of sale
Sales to clients	$ 223,148	$ 239,543	$ 238,650	$ 220,858	$ 239,784	$ 202,149	$ 192,275	$ 175,259	$ 922,200	$ 809,467	$ 780,033
Property, plant, and equipment, net	121,792				122,219				121,792	122,219	135,045
United States
Sales to clients attributed to the geographic areas based on the origin of sale
Sales to clients									797,834	688,914	688,664
Property, plant, and equipment, net	77,230				75,228				77,230	75,228	83,291
Canada
Sales to clients attributed to the geographic areas based on the origin of sale
Sales to clients									44,225	34,267	26,831
Property, plant, and equipment, net	29,110				31,435				29,110	31,435	33,112
Europe
Sales to clients attributed to the geographic areas based on the origin of sale
Sales to clients									80,141	86,286	64,538
Property, plant, and equipment, net	$ 15,452				$ 15,556				$ 15,452	$ 15,556	$ 18,642

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, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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