REVENUE RECOGNITION AND RELATED ALLOWANCES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 31,535
Ending balance	29,481
Chargebacks [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	26,785	$ 11,381
Accruals/Adjustments	38,191	14,778
Credits Taken Against Reserve	(40,442)	(15,256)
Ending balance	24,534	10,903
Government Rebates [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	5,891	4,631
Accruals/Adjustments	1,821	2,607
Credits Taken Against Reserve	(3,057)	(3,814)
Ending balance	4,655	3,424
Allowance for Sales Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	5,756	2,648
Accruals/Adjustments	1,855	1,637
Credits Taken Against Reserve	(1,835)	(1,619)
Ending balance	5,776	2,666
Administrative Fees And Other Rebates [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	3,550	1,653
Accruals/Adjustments	5,030	2,089
Credits Taken Against Reserve	(4,755)	(1,470)
Ending balance	3,825	2,272
Prompt Payment Discounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	1,554	674
Accruals/Adjustments	1,662	813
Credits Taken Against Reserve	(1,737)	(835)
Ending balance	$ 1,479	$ 652