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SEGMENT AND GEOGRAPHIC INFORMATION: (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
SEGMENT AND GEOGRAPHIC INFORMATION
Net product sales	$ 528,369	$ 517,149	$ 495,592
Long-lived assets	212,162	215,492	220,721
United States
SEGMENT AND GEOGRAPHIC INFORMATION
Net product sales	487,185	471,714	455,517
Long-lived assets	170,173	172,087	176,044
Foreign
SEGMENT AND GEOGRAPHIC INFORMATION
Net product sales	41,184	45,435	40,075
Long-lived assets	$ 41,989	$ 43,405	$ 44,677

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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