Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net sales:
Net sales	$ 1,138,988	$ 1,050,582	$ 1,168,070
Cost of sales (excluding below amortization of intangible assets):
Cost of sales	322,278	321,631	312,357
Gross profit	816,710	728,951	855,713
Operating expenses:
Selling, general and administrative	610,085	547,195	611,181
Research and development	92,626	79,838	72,380
Amortization of intangible assets	57,309	51,726	51,097
Purchase of in-process research and development		1,011
Business transition costs	68,719	10,878	(1,995)
Total operating expenses	828,739	690,648	732,663
Interest and other expense, net:
Interest income	160	1,472	1,917
Interest expense	(21,056)	(70,466)	(38,525)
Other expense, net	(25,459)	(16,854)	(5,925)
Total interest and other expense, net	(46,355)	(85,848)	(42,533)
(Loss) income before income taxes	(58,384)	(47,545)	80,517
Income tax (expense) benefit	(5,702)	10,392	(15,283)
Consolidated net (loss) income	$ (64,086)	$ (37,153)	$ 65,234
Net (loss) income per share:
Basic	$ (1.24)	$ (0.72)	$ 1.26
Diluted	$ (1.24)	$ (0.72)	$ 1.23
Weighted average shares outstanding:
Basic	51,589	51,416	51,956
Diluted	51,589	51,416	53,160
Product [Member]
Net sales:
Net sales	$ 1,034,612	$ 950,189	$ 1,044,569
Cost of sales (excluding below amortization of intangible assets):
Cost of sales	245,569	247,809	232,474
Service [Member]
Net sales:
Net sales	104,376	100,393	123,501
Cost of sales (excluding below amortization of intangible assets):
Cost of sales	$ 76,709	$ 73,822	$ 79,883