Consolidated Statements of Comprehensive (Loss) Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
REVENUES	$ 841,045	$ 1,116,843	$ 985,076
Cost of sales (exclusive of amortization of intangibles, included within operating expenses below)	407,898	442,572	389,064
GROSS PROFIT	433,147	674,271	596,012
Selling, general and administrative expenses	216,086	197,501	162,205
Acquisition-related costs	159	364	1,841
Research and development expenses	80,502	42,603	40,707
Amortization of intangibles	61,443	65,713	66,272
Impairment of intangible assets	92,613	40,519	30,376
TOTAL OPERATING EXPENSES	450,803	346,700	301,401
OPERATING (LOSS) INCOME	(17,656)	327,571	294,611
Amortization of deferred financing costs	(5,216)	(10,791)	(4,283)
Interest expense, net	(38,070)	(42,734)	(51,973)
Bargain purchase gain	0	0	849
Other non-operating income (expense), net	1,744	(2,746)	(7,048)
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(59,198)	271,300	232,156
Income tax (benefit) provision	(34,648)	87,057	81,358
(LOSS) INCOME FROM CONTINUING OPERATIONS	(24,550)	184,243	150,798
CONSOLIDATED NET (LOSS) INCOME	$ (24,550)	$ 184,243	$ 150,798
CONSOLIDATED NET (LOSS) INCOME PER COMMON SHARE:
(Loss) income from continuing operations, basic (in Dollars per share)	$ (0.20)	$ 1.50	$ 1.29
CONSOLIDATED NET (LOSS) INCOME, BASIC (in Dollars per share)	(0.20)	1.50	1.29
(Loss) income from continuing operations, diluted (in Dollars per share)	(0.20)	1.47	1.22
CONSOLIDATED NET (LOSS) INCOME, DILUTED (in Dollars per share)	$ (0.20)	$ 1.47	$ 1.22
SHARES USED IN COMPUTING CONSOLIDATED NET (LOSS) INCOME PER COMMON SHARE:
BASIC (in Shares)	124,790	122,869	116,980
DILUTED (in Shares)	124,790	125,801	125,762
COMPREHENSIVE (LOSS) INCOME:
Consolidated net (loss) income	$ (24,550)	$ 184,243	$ 150,798
Unrealized holding gain on available-for-sale securities, net of tax of ($157), ($436) and ($61) for the years ended December 31, 2017, 2016 and 2015, respectively.	267	740	104
Foreign currency translation gain (loss) for the years ended December 31, 2017, 2016 and 2015, respectively.	6,150	(1,941)	(2,051)
Pension liability adjustment, net of tax of ($403) and $694 for the year ended December 31, 2017 and 2016, respectively.	1,582	(3,624)	0
COMPREHENSIVE (LOSS) INCOME	$ (16,551)	$ 179,418	$ 148,851