REVENUE RECOGNITION AND RELATED ALLOWANCES (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 34,686
Ending balance	30,786
Chargebacks [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	28,230	$ 26,785
Accruals/Adjustments	38,217	38,191
Credits Taken Against Reserve	(42,696)	(40,442)
Ending balance	23,751	24,534
Government Rebates [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	7,930	5,891
Accruals/Adjustments	1,795	1,821
Credits Taken Against Reserve	(3,254)	(3,057)
Ending balance	6,471	4,655
Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	8,274	5,756
Accruals/Adjustments	3,644	1,855
Credits Taken Against Reserve	(2,898)	(1,835)
Ending balance	9,020	5,776
Administrative Fees And Other Rebates [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	5,226	3,550
Accruals/Adjustments	7,584	5,030
Credits Taken Against Reserve	(6,792)	(4,755)
Ending balance	6,018	3,825
Prompt Payment Discounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	1,834	1,554
Accruals/Adjustments	1,890	1,662
Credits Taken Against Reserve	(2,142)	(1,737)
Ending balance	$ 1,582	$ 1,479