BUSINESS ACQUISITIONS - Pro Forma Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Business Acquisition [Line Items]
Total revenue, net	$ 215,059	$ 196,652
Net income (loss)	2,206	(6,028)
Earnings Per Share, Basic	$ 0.07	$ (0.22)
Earnings Per Share, Diluted	$ 0.07	$ (0.22)
Confluent Surgical, Inc.
Business Acquisition [Line Items]
Total revenue, net		213,051
Net income (loss)		$ (5,469)
Earnings Per Share, Basic		$ (0.17)
Earnings Per Share, Diluted		$ (0.17)