Consolidated Statements of Comprehensive (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
REVENUES	$ 682,429	$ 694,018	$ 841,045
Cost of sales (exclusive of amortization of intangibles, included within operating expenses below)	429,723	448,002	408,839
GROSS PROFIT	252,706	246,016	432,206
Selling, general and administrative expenses	273,871	279,749	216,483
Research and development expenses	37,500	47,321	44,988
Amortization of intangibles	39,765	53,472	61,443
Impairment of goodwill	15,955	0	0
Impairment of intangible assets	29,497	231,086	128,127
Litigation rulings, settlements and contingencies	44,179	22,814	4,049
TOTAL OPERATING EXPENSES	440,767	634,442	455,090
OPERATING (LOSS)	(188,061)	(388,426)	(22,884)
Amortization of deferred financing costs	(31,554)	(5,216)	(5,216)
Interest expense, net	(69,353)	(45,900)	(38,070)
Other non-operating income, net	1,190	1,360	6,972
(LOSS) BEFORE INCOME TAXES	(287,778)	(438,182)	(59,198)
Income tax (benefit)	(61,008)	(36,273)	(34,648)
NET (LOSS)	$ (226,770)	$ (401,909)	$ (24,550)
NET (LOSS) PER COMMON SHARE:
Net (Loss), basic and diluted (in dollars per share)	$ (1.80)	$ (3.21)	$ (0.20)
SHARES USED IN COMPUTING NET (LOSS) PER COMMON SHARE:
WEIGHTED AVERAGE BASIC AND DILUTED	125,977	125,383	124,790
COMPREHENSIVE (LOSS):
Net (loss)	$ (226,770)	$ (401,909)	$ (24,550)
Unrealized holding (loss) gain on available-for-sale securities, net of tax of $1, $6 and ($157) for the years ended December 31, 2019, 2018 and 2017, respectively.	(5)	(21)	267
Foreign currency translation (loss) gain for the years ended December 31, 2019, 2018 and 2017, respectively.	(667)	(8,001)	6,150
Pension liability adjustment (loss) gain, net of tax of $787, $389 and ($403) for the year ended December 31, 2019, 2018 and 2017, respectively.	(3,100)	(1,529)	1,582
COMPREHENSIVE (LOSS)	$ (230,542)	$ (411,460)	$ (16,551)