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	34,212	53,742	52,741
Provisions related to current period sales	100,926	106,988	113,969
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	47,622	34,212	53,742
Revenue, Allowance [Roll Forward]
Balance at Beginning of Period	91,411	115,906	100,341
Provisions related to current period sales	622,842	496,849	428,506
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	$ 142,843	$ 91,411	$ 115,906