BASIS OF PRESENTATION - Narrative (Details) $ / shares in Units, $ in Thousands				3 Months Ended
	May 15, 2017 USD ($)	Feb. 14, 2017 USD ($)	Dec. 21, 2016 $ / shares shares	Mar. 31, 2017 USD ($) $ / shares shares	Mar. 31, 2016 USD ($)	Dec. 31, 2016 $ / shares shares	Dec. 20, 2016 shares
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common stock, shares authorized (in shares) | shares			240,000,000.0	240,000,000		240,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.01	$ 0.01		$ 0.01
Stock split, conversion ratio			2
Net cash provided by operating activities				$ 28,882	$ 25,030
Net cash used in financing activities				$ (185,039)	(9,952)
Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax benefit					1,800
Net cash provided by operating activities					5,900
Net cash used in financing activities					$ 5,900
Scenario, Previously Reported
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common stock, shares authorized (in shares) | shares							60,000,000.0
DePuy Synthes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Alternative transaction threshold, percentage of assets		25.00%
Reimbursement fee if offer not accepted prior to expiration		$ 10,500
Termination fee due if alternate proposal accepted		$ 41,800
DePuy Synthes | Scenario, Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration for acquisition	$ 1,000,000