CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME / (LOSS) (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Total revenue, net	$ 258,665	$ 383,645	$ 612,989	$ 743,335
Costs and expenses:
Cost of goods sold	105,478	143,671	238,954	272,583
Research and development	14,926	17,633	35,742	35,954
Selling, general and administrative	116,108	165,378	282,060	340,247
Intangible asset amortization	8,073	11,004	15,050	16,284
Total costs and expenses	244,585	337,686	571,806	665,068
Operating income	14,080	45,959	41,183	78,267
Interest income	2,281	2,710	4,851	5,138
Interest expense	(15,682)	(13,384)	(33,434)	(26,533)
Other income, net	972	1,098	493	4,334
Income before income taxes	1,651	36,383	13,093	61,206
Provision (benefit) for income taxes	2,020	6,647	4,282	(1,286)
Net income (loss)	$ (369)	$ 29,736	$ 8,811	$ 62,492
Net income (loss) per share
Basic (in dollars per share)	$ 0.00	$ 0.35	$ 0.10	$ 0.73
Diluted (in dollars per share)	$ 0.00	$ 0.34	$ 0.10	$ 0.72
Weighted average common shares outstanding (See Note 13):
Basic (in shares)	84,706	85,577	84,955	85,460
Diluted (in shares)	84,706	86,257	85,548	86,407
Comprehensive income (loss) (See Note 14)	$ 1,095	$ 17,714	$ (17,912)	$ 39,235