SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule Of Property, Plant And Equipment Balances And Corresponding Lives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 555,292	$ 489,185
Less: Accumulated depreciation	(255,180)	(219,934)
Property, plant and equipment, net	300,112	269,251
Land
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	1,837	1,881
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 20,472	20,243
Buildings and building improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Buildings and building improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 105,063	90,329
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	1 year
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Machinery and production equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 143,921	137,914
Machinery and production equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Machinery and production equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Surgical instrument kits
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 31,231	30,511
Surgical instrument kits | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	4 years
Surgical instrument kits | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Information systems and hardware
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 129,962	127,946
Information systems and hardware | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	1 year
Information systems and hardware | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	7 years
Furniture, fixtures, and office equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 17,731	17,394
Furniture, fixtures, and office equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	1 year
Furniture, fixtures, and office equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	15 years
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 105,075	$ 62,967