REVENUE RECOGNITION - Product Revenue Allowance and Accrual Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Contractual Adjustments
Balance at Beginning of Period	$ 57,199	$ 62,164	$ 47,600
Provisions related to current period sales	521,916	389,861	314,537
Adjustments related to prior period sales	8,774	(2,330)	(3,949)
Payments/returns relating to current period sales	(431,014)	(333,694)	(253,545)
Payments/returns relating to prior period sales	(61,654)	(58,802)	(42,479)
Balance at End of Period	95,221	57,199	62,164
Governmental Rebates
Balance at Beginning of Period	29,114	50,598	51,399
Provisions related to current period sales	99,721	105,034	112,167
Adjustments related to prior period sales	14,137	7,903	1,661
Payments/returns relating to current period sales	(60,218)	(75,920)	(61,569)
Payments/returns relating to prior period sales	(41,435)	(58,501)	(53,060)
Balance at End of Period	41,319	29,114	50,598
Revenue, Allowance [Roll Forward]
Balance at Beginning of Period	86,313	112,762	98,999
Provisions related to current period sales	621,637	494,895	426,704
Adjustments related to prior period sales	22,911	5,573	(2,288)
Payments/returns relating to current period sales	(491,232)	(409,614)	(315,114)
Payments/returns relating to prior period sales	(103,089)	(117,303)	(95,539)
Balance at End of Period	$ 136,540	$ 86,313	$ 112,762