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SEGMENT AND GEOGRAPHIC INFORMATION: (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
SEGMENT AND GEOGRAPHIC INFORMATION
Net product sales:	$ 545,985	$ 528,369	$ 517,149
Long-lived assets:	201,290	212,162	215,492
United States
SEGMENT AND GEOGRAPHIC INFORMATION
Net product sales:	499,660	487,185	471,714
Long-lived assets:	161,504	170,173	172,087
Foreign
SEGMENT AND GEOGRAPHIC INFORMATION
Net product sales:	46,325	41,184	45,435
Long-lived assets:	$ 39,786	$ 41,989	$ 43,405

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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