SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SEGMENT AND GEOGRAPHIC INFORMATION
Net product sales:	$ 124,279	$ 185,473	$ 104,259	$ 103,362	$ 139,881	$ 183,806	$ 107,528	$ 105,477	$ 517,373	$ 536,692	$ 539,895
Long-lived assets:	180,905				184,586				180,905	184,586	190,081
United States
SEGMENT AND GEOGRAPHIC INFORMATION
Net product sales:									475,055	492,450	488,795
Long-lived assets:	147,296				149,144				147,296	149,144	153,444
Canada
SEGMENT AND GEOGRAPHIC INFORMATION
Long-lived assets:	29,806				31,408				29,806	31,408	32,114
Canada, Mexico, and Other
SEGMENT AND GEOGRAPHIC INFORMATION
Net product sales:									42,318	44,242	51,100
Mexico and Other
SEGMENT AND GEOGRAPHIC INFORMATION
Long-lived assets:	$ 3,803				$ 4,034				$ 3,803	$ 4,034	$ 4,523