CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Total revenue	$ 486,423	$ 499,065
Total cost of revenue	(202,049)	(199,623)
Gross profit	284,374	299,442
Selling, general and administrative expense	(237,204)	(230,177)
Restructuring and integration expense	(18,483)	(6,283)
Asset impairment charges	(90,330)	0
Operating (loss) income	(60,814)	63,773
Interest expense	(6,999)	(9,301)
Other income	4,472	1,766
(Loss) income before income taxes	(63,341)	56,238
Income tax benefit (provision)	3,210	(15,048)
Net (loss) income	(60,131)	41,190
Comprehensive (loss) income	$ (72,138)	$ 43,080
Basic (loss) earnings per share	$ (1.43)	$ 0.93
Diluted (loss) earnings per share	$ (1.45)	$ 0.93
Operating expenses [Member]
Restructuring and integration expense	$ (17,654)	$ (5,492)
Product [Member]
Total revenue	330,687	350,519
Total cost of revenue	(121,587)	(131,263)
Service [Member]
Total revenue	155,736	148,546
Total cost of revenue	$ (80,462)	$ (68,360)