Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenues, net	$ 253,420	$ 268,347
Cost of sales (exclusive of amortization of intangibles, included within operating expenses below)	104,288	105,330
GROSS PROFIT	149,132	163,017
Selling, general and administrative expenses	47,526	49,086
Acquisition-related costs	11	197
Research and development expenses	11,291	9,479
Amortization of intangibles	15,471	16,518
Impairment of intangible assets	0	158
TOTAL OPERATING EXPENSES	74,299	75,438
OPERATING INCOME	74,833	87,579
Amortization of deferred financing costs	(1,304)	(6,311)
Interest expense, net	(9,566)	(11,518)
Other non-operating income (expense), net	1,363	(3,178)
INCOME BEFORE INCOME TAXES	65,326	66,572
Income tax provision	24,299	24,686
CONSOLIDATED NET INCOME	$ 41,027	$ 41,886
CONSOLIDATED NET INCOME PER SHARE
CONSOLIDATED NET INCOME, BASIC (in Dollars per share)	$ 0.33	$ 0.35
CONSOLIDATED NET INCOME, DILUTED (in Dollars per share)	$ 0.33	$ 0.34
SHARES USED IN COMPUTING NET INCOME PER SHARE
BASIC (in Shares)	124,421	119,516
DILUTED (in Shares)	124,666	125,621
COMPREHENSIVE INCOME
Consolidated net income	$ 41,027	$ 41,886
Unrealized holding gain (loss) on available-for-sale securities, net of tax of $75 and $386 for the three months ended March 31, 2017 and 2016, respectively.	128	(654)
Foreign currency translation gain	4,026	869
Pension liability adjustment gain, net of tax of $57 and $0 for the three months ended March 31, 2017 and 2016, respectively.	223	0
COMPREHENSIVE INCOME	$ 45,404	$ 42,101