CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES:
Net income (loss)	$ 46,316	$ (18,499)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Loss from discontinued operations, net of tax	0	10,370
Depreciation and amortization	54,353	40,596
Deferred income tax	(2,919)	32,578
Amortization of debt issuance costs	1,623	1,645
Non-cash interest expense	6,300	5,874
Loss on disposal of property and equipment	1,046	124
Change in fair value of contingent consideration	81	359
Share-based compensation	12,773	11,788
Payment of accreted interest	0	(384)
Changes in assets and liabilities, net of business acquisitions:
Accounts receivable	(8,100)	(9,206)
Inventories	(9,061)	(8,005)
Prepaid expenses and other current assets	1,051	7,423
Other non-current assets	(552)	1,224
Accounts payable, accrued expenses and other current liabilities	5,831	15,793
Deferred revenue	1,381	(185)
Other non-current liabilities	(247)	(72)
Net cash provided by operating activities of continuing operations	109,876	91,423
Net cash used in operating activities of discontinued operations	0	(12,209)
Net cash provided by operating activities	109,876	79,214
INVESTING ACTIVITIES:
Purchases of property and equipment	(26,136)	(20,314)
Sale of property and equipment	266	1,438
Cash used in business acquisition, net of cash acquired	0	(308,256)
Cash received from business acquisition purchase price adjustment	225	0
Change in restricted cash	4,165	0
Net cash used in investing activities of continuing operations	(21,480)	(327,132)
Net cash used in investing activities of discontinued operations	0	(7,060)
Net cash used in investing activities	(21,480)	(334,192)
FINANCING ACTIVITIES:
Borrowings under senior credit facility	15,000	545,000
Repayments under senior credit facility	(48,750)	(448,750)
Repayment of 2016 convertible notes	0	(2,519)
Distribution to SeaSpine	0	(47,013)
Payment of debt issuance costs	0	(1,050)
Proceeds from the issuance of common stock, net of issuance costs	0	219,888
Principal payments under capital lease obligations	(487)	(553)
Proceeds from exercised stock options	9,925	7,345
Cash taxes paid in net equity settlement	(4,567)	(6,446)
Net cash (used in) provided by financing activities	(28,879)	265,902
Effect of exchange rate changes on cash and cash equivalents	(51)	(3,347)
Net increase in cash and cash equivalents	59,466	7,577
Cash and cash equivalents at beginning of period	48,132	71,734
Cash and cash equivalents at end of period	$ 107,598	$ 79,311