ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product & Services (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Summary of Significant Accounting Policies
Net revenues	$ 262,946	$ 257,966	$ 763,907	$ 755,033
Products & Services
Summary of Significant Accounting Policies
Net revenues	48,866	47,329	$ 143,162	140,538
Products & Services | Minimum
Summary of Significant Accounting Policies
Payment terms			30 days
Products & Services | Maximum
Summary of Significant Accounting Policies
Payment terms			90 days
Products & Services | Before adoption of ASC 606
Summary of Significant Accounting Policies
Net revenues		47,329		140,538
Products & Services | Distribution, net of intersegment revenue eliminations
Summary of Significant Accounting Policies
Net revenues	34,666		$ 100,700
Products & Services | Distribution, net of intersegment revenue eliminations | Before adoption of ASC 606
Summary of Significant Accounting Policies
Net revenues		32,439		95,030
Products & Services | Therapeutic solutions
Summary of Significant Accounting Policies
Net revenues	$ 14,200		$ 42,462
Products & Services | Therapeutic solutions | Before adoption of ASC 606
Summary of Significant Accounting Policies
Net revenues		$ 14,890		$ 45,508