CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME / (LOSS) (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Total revenue, net	$ 370,232	$ 379,095	$ 983,221	$ 1,122,430
Costs and expenses:
Cost of goods sold	134,811	142,636	373,765	415,219
Research and development	19,460	19,003	55,202	54,957
In-process research and development	0	59,889	0	59,889
Selling, general and administrative	150,076	173,098	432,136	513,345
Intangible asset amortization	8,343	5,056	23,393	21,340
Total costs and expenses	312,690	399,682	884,496	1,064,750
Operating income (loss)	57,542	(20,587)	98,725	57,680
Interest income	2,273	2,913	7,124	8,051
Interest expense	(20,796)	(13,962)	(54,230)	(40,495)
Other income, net	2,492	4,127	2,985	8,461
Income (loss) before income taxes	41,511	(27,509)	54,604	33,697
Provision (benefit) for income taxes	9,174	101	13,456	(1,185)
Net income (loss)	$ 32,337	$ (27,610)	$ 41,148	$ 34,882
Net income (loss) per share
Basic (in dollars per share)	$ 0.38	$ (0.32)	$ 0.49	$ 0.41
Diluted (in dollars per share)	$ 0.38	$ (0.32)	$ 0.48	$ 0.40
Weighted average common shares outstanding (See Note 14):
Basic (in shares)	84,325	85,688	84,745	85,536
Diluted (in shares)	84,752	85,688	85,303	86,581
Comprehensive income (loss) (See Note 15)	$ 43,548	$ (46,521)	$ 25,637	$ (7,288)