Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenues, net	$ 190,944	$ 199,140	$ 375,007	$ 452,560
Cost of sales (exclusive of amortization of intangibles, included within operating expenses below)	109,665	96,371	211,500	201,022
GROSS PROFIT	81,279	102,769	163,507	251,538
Selling, general and administrative expenses	83,694	53,981	146,677	101,564
Acquisition-related costs	64	76	75	87
Research and development expenses	74,271	15,876	105,238	27,167
Amortization of intangibles	13,182	15,504	26,372	30,975
Impairment of intangible assets	1,634	3,058	2,126	3,058
TOTAL OPERATING EXPENSES	172,845	88,495	280,488	162,851
OPERATING (LOSS) INCOME	(91,566)	14,274	(116,981)	88,687
Amortization of deferred financing costs	(1,304)	(1,304)	(2,608)	(2,608)
Interest expense, net	(11,062)	(9,380)	(20,640)	(18,946)
Other non-operating income, net	(324)	3,160	(54)	4,943
(LOSS) INCOME BEFORE INCOME TAXES	(104,256)	6,750	(140,283)	72,076
Income tax (benefit) provision	(16,272)	4,213	(23,552)	28,512
CONSOLIDATED NET (LOSS) INCOME	$ (87,984)	$ 2,537	$ (116,731)	$ 43,564
CONSOLIDATED NET (LOSS) INCOME PER SHARE
CONSOLIDATED NET (LOSS) INCOME PER SHARE, BASIC (in Dollars per share)	$ (0.70)	$ 0.02	$ (0.93)	$ 0.35
CONSOLIDATED NET (LOSS) INCOME PER SHARE, DILUTED (in Dollars per share)	$ (0.70)	$ 0.02	$ (0.93)	$ 0.35
SHARES USED IN COMPUTING NET (LOSS) INCOME PER SHARE
BASIC (in Shares)	125,332	124,660	125,286	124,541
DILUTED (in Shares)	125,332	125,194	125,286	124,855
COMPREHENSIVE (LOSS) INCOME
Consolidated net (loss) income	$ (87,984)	$ 2,537	$ (116,731)	$ 43,564
Unrealized holding (loss) gain on available-for-sale securities, net of tax of $1 and ($85) for the three months ended June 30, 2018 and 2017, and $1 and ($160) for the six month periods ended June 30, 2018 and 2017 respectively.	(4)	144	(5)	272
Foreign currency translation (loss) gain	(6,350)	1,239	(7,198)	5,265
Pension liability adjustment gain, net of tax of ($1) and ($6) for the three months ended June 30, 2018 and 2017, and ($2) and ($63) for the six month periods ended June 30, 2018 and 2017 respectively.	4	24	8	247
COMPREHENSIVE (LOSS) INCOME	$ (94,334)	$ 3,944	$ (123,926)	$ 49,348