Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenues, net	$ 202,428	$ 284,095	$ 654,988	$ 833,176
Cost of sales (exclusive of amortization of intangibles, included within operating expenses below)	104,465	113,868	304,926	328,159
GROSS PROFIT	97,963	170,227	350,062	505,017
Selling, general and administrative expenses	53,341	47,074	154,790	150,131
Acquisition-related costs	34	23	121	356
Research and development expenses	12,250	10,618	39,417	28,965
Amortization of intangibles	15,316	16,474	46,291	49,422
Impairment of intangible assets	7,599	9,210	10,657	9,368
TOTAL OPERATING EXPENSES	88,540	83,399	251,276	238,242
OPERATING INCOME	9,423	86,828	98,786	266,775
Amortization of deferred financing costs	(1,304)	(1,304)	(3,912)	(9,487)
Interest expense, net	(9,592)	(10,344)	(28,538)	(32,630)
Other non-operating income (expense), net	(464)	34	3,803	(2,597)
INCOME (LOSS) BEFORE INCOME TAXES	(1,937)	75,214	70,139	222,061
Income tax provision	960	27,305	29,472	70,273
CONSOLIDATED NET INCOME (LOSS)	$ (2,897)	$ 47,909	$ 40,667	$ 151,788
CONSOLIDATED NET INCOME (LOSS) PER SHARE
CONSOLIDATED NET INCOME (LOSS) PER SHARE, BASIC (in Dollars per share)	$ (0.02)	$ 0.38	$ 0.33	$ 1.24
CONSOLIDATED NET INCOME (LOSS) PER SHARE, DILUTED (in Dollars per share)	$ (0.02)	$ 0.38	$ 0.33	$ 1.21
SHARES USED IN COMPUTING NET INCOME (LOSS) PER SHARE
BASIC (in Shares)	124,986	125,855	124,691	122,232
DILUTED (in Shares)	124,986	126,334	125,046	126,065
COMPREHENSIVE INCOME (LOSS)
Consolidated net income (loss)	$ (2,897)	$ 47,909	$ 40,667	$ 151,788
Unrealized holding gain (loss) on available-for-sale securities, net of tax of $3 and $125 for the three months ended September 30, 2017 and 2016. ($158) and ($450) for the nine month period ended September 30, 2017 and 2016 respectively.	(5)	(212)	267	763
Foreign currency translation gain (loss)	(1,137)	1,276	4,128	837
Pension liability adjustment gain (loss), net of tax of ($6) and $0 for the three months ended September 30, 2017 and 2016, and ($69) and $694 for the nine month period ended September 30, 2017 and 2016 respectively.	24	161	271	(2,566)
COMPREHENSIVE INCOME (LOSS)	$ (4,015)	$ 49,134	$ 45,333	$ 150,822