Consolidated Statements of Comprehensive (Loss) Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
REVENUES	$ 694,018	$ 841,045	$ 1,116,843
Cost of sales (exclusive of amortization of intangibles, included within operating expenses below)	448,002	408,839	443,331
GROSS PROFIT	246,016	432,206	673,512
Selling, general and administrative expenses	279,628	216,324	197,631
Acquisition-related costs	121	159	364
Research and development expenses	47,321	44,988	38,753
Amortization of intangibles	53,472	61,443	65,713
Impairment of intangible assets	231,086	128,127	44,369
Litigation rulings and settlements	22,814	4,049	3,824
TOTAL OPERATING EXPENSES	634,442	455,090	350,654
OPERATING (LOSS) INCOME	(388,426)	(22,884)	322,858
Amortization of deferred financing costs	(5,216)	(5,216)	(10,791)
Interest expense, net	(45,900)	(38,070)	(42,734)
Other non-operating income (expense), net	1,360	6,972	1,967
(LOSS) INCOME BEFORE INCOME TAXES	(438,182)	(59,198)	271,300
Income tax (benefit) provision	(36,273)	(34,648)	87,057
NET (LOSS) INCOME	$ (401,909)	$ (24,550)	$ 184,243
NET (LOSS) INCOME PER COMMON SHARE:
NET (LOSS) iNCOME, BASIC (in Dollars per share)	$ (3.21)	$ (0.20)	$ 1.50
NET (LOSS) iNCOME, DILUTED (in Dollars per share)	$ (3.21)	$ (0.20)	$ 1.47
SHARES USED IN COMPUTING NET (LOSS) INCOME PER COMMON SHARE:
BASIC (in Shares)	125,383	124,790	122,869
DILUTED (in Shares)	125,383	124,790	125,801
COMPREHENSIVE (LOSS) INCOME:
NET (LOSS) INCOME	$ (401,909)	$ (24,550)	$ 184,243
Unrealized holding (loss) gain on available-for-sale securities, net of tax of $6, ($157) and ($436) for the years ended December 31, 2018, 2017 and 2016, respectively.	(21)	267	740
Foreign currency translation (loss) gain for the years ended December 31, 2018, 2017 and 2016, respectively.	(8,001)	6,150	(1,941)
Pension liability adjustment, net of tax of $389, ($403) and $694 for the year ended December 31, 2018, 2017 and 2016, respectively.	(1,529)	1,582	(3,624)
COMPREHENSIVE (LOSS) INCOME	$ (411,460)	$ (16,551)	$ 179,418