SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)						1 Months Ended	3 Months Ended		12 Months Ended			30 Months Ended
	Jul. 31, 2017 Segment	Dec. 21, 2016 shares	Dec. 15, 2016 shares	Oct. 25, 2016 $ / shares shares	Jul. 02, 2015	Dec. 31, 2016 USD ($) $ / shares shares	Sep. 30, 2017 USD ($)	Mar. 31, 2015 Segment	Dec. 31, 2017 USD ($) Customer Segment $ / shares shares	Dec. 31, 2016 USD ($) Customer $ / shares shares	Dec. 31, 2015 USD ($) Customer	Dec. 31, 2017 USD ($) Segment $ / shares shares	Oct. 24, 2016 shares
Summary Of Significant Accounting Policies [Line Items]
Stock split ratio, Common stock		2		2
Provision for doubtful accounts									$ 2,000,000	$ 400,000	$ 1,000,000
Inventory, capitalized expenses									0	0
Depreciation expense									36,100,000	31,200,000	27,000,000
Interest expense capitalized to property, plant, and equipment									$ 1,100,000	1,000,000
Number of reportable segments | Segment								3	2			2
Number of underlying reporting units | Segment	3								3
Goodwill, impairment loss									$ 0
Impairment of indefinite-lived Assets							$ 0
Amortization expense									52,800,000	41,500,000	32,200,000
Annual amortization expense expected to approximate in 2018									66,900,000			$ 66,900,000
Annual amortization expense expected to approximate in 2019									66,800,000			66,800,000
Annual amortization expense expected to approximate in 2020									66,700,000			66,700,000
Annual amortization expense expected to approximate in 2021									65,700,000			65,700,000
Annual amortization expense expected to approximate in 2022									62,200,000			62,200,000
Annual amortization expense expected to approximate thereafter									658,900,000			658,900,000
Charitable contributions									500,000	0	900,000
Foreign currency transaction (loss) gain									$ (2,900,000)	300,000	(500,000)
Number of days from shipment to issue a credit									90 days
Distribution and handling costs									$ 13,500,000	13,600,000	13,700,000
Extended warranties, in years (up to)									2 years
Accrued warranty expense						$ 800,000			$ 700,000	$ 800,000		$ 700,000
Common stock, shares authorized (in shares) | shares				240,000,000.0		240,000,000			240,000,000	240,000,000		240,000,000	60,000,000.0
Common stock, par value (in dollars per share) | $ / shares				$ 0.01		$ 0.01			$ 0.01	$ 0.01		$ 0.01
Stock split, number of additional shares of common stock for each share held (in shares) | shares		1
Fractional shares issued (in shares) | shares		0
Defined benefit plan, contributions by employer									$ 450,000		1,800,000
Defined benefit plan, recognized net gain (loss) due to settlements and curtailments											(5,600,000)
Pension contributions									500,000	$ 0	2,200,000
Payment of accreted interest									0	(42,786,000)	(384,000)
Interest paid									32,300,000	14,400,000	12,700,000
Interest paid, capitalized into construction in progress									1,100,000	1,000,000	1,700,000
Stock issued during period, shares, conversion of convertible securities (in shares) | shares			2,900,000
Treasury stock, cost						$ 123,100,000			121,600,000	123,100,000		$ 121,600,000
Income taxes paid									14,600,000	4,300,000	21,300,000
Property and equipment purchases included in liabilities									$ 7,800,000	$ 4,700,000	$ 4,700,000
Sales Revenue, Net
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, number of customers over benchmark | Customer									0	0	0
Concentration risk, percentage									10.00%	10.00%	10.00%
Common Stock
Summary Of Significant Accounting Policies [Line Items]
Settlement of convertible notes						$ 122,000,000				$ 29,000
Stock issued during period, shares, conversion of convertible securities (in shares) | shares						2,900,000				2,946,000
Exercise of warrants (in shares) | shares									2,840,000
2016 Convertible Senior Notes
Summary Of Significant Accounting Policies [Line Items]
Interest rate on debt						1.625%				1.625%	1.625%
Tarsus Medical, Inc. | Orthopedics and Tissue Technologies
Summary Of Significant Accounting Policies [Line Items]
Impairment of finite-lived assets							$ 3,300,000
In-process research and development
Summary Of Significant Accounting Policies [Line Items]
Impairment charges									$ 0	$ 0	$ 400,000
Technology
Summary Of Significant Accounting Policies [Line Items]
Amortization expense, included in cost of product revenues									$ 35,700,000	27,600,000	$ 22,300,000
Computer Equipment
Summary Of Significant Accounting Policies [Line Items]
Capital leased assets, gross						$ 2,000,000				2,000,000
Capital leases, accumulated depreciation						$ 2,000,000				$ 2,000,000
SeaSpine Inc. | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Summary Of Significant Accounting Policies [Line Items]
Distribution of spinoff shares					100.00%
Shares of Integra for share of SeaSpine					0.3333
Convertible Debt
Summary Of Significant Accounting Policies [Line Items]
Warrants exercised (in shares) | shares									8,707,202
Exercise of warrants (in shares) | shares									2,839,743
Convertible Debt | 2016 Convertible Senior Notes
Summary Of Significant Accounting Policies [Line Items]
Interest rate on debt			1.625%