REVENUE RECOGNITION AND RELATED ALLOWANCES (Details 2) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 34,686
Ending balance	50,603
Chargebacks [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	28,230	$ 26,785
Accruals/Adjustments	170,533	133,849
Credits Taken Against Reserve	(156,750)	(134,412)
Ending balance	42,013	26,222
Government Rebates [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	7,930	5,891
Accruals/Adjustments	8,097	7,807
Credits Taken Against Reserve	(7,013)	(7,943)
Ending balance	9,014	5,755
Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	8,274	5,756
Accruals/Adjustments	10,942	8,949
Credits Taken Against Reserve	(8,376)	(6,388)
Ending balance	10,840	8,317
Administrative Fees And Other Rebates [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	5,226	3,550
Accruals/Adjustments	23,148	16,840
Credits Taken Against Reserve	(21,418)	(15,448)
Ending balance	6,956	4,942
Prompt Payment Discounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	1,834	1,554
Accruals/Adjustments	6,744	5,960
Credits Taken Against Reserve	(6,373)	(5,617)
Ending balance	$ 2,205	$ 1,897