CONSOLIDATED STATEMENTS OF (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total revenue	$ 2,008,715	$ 1,998,025	$ 1,965,556
Total cost of revenue	(812,935)	(791,748)	(742,707)
Gross profit	1,195,780	1,206,277	1,222,849
Selling, general and administrative expense	(891,693)	(854,000)	(830,231)
Restructuring and integration expense	(74,810)	(21,203)	(9,130)
Asset impairment charges	(390,980)	(101,319)	(54,880)
Operating (loss) income	(158,141)	231,221	329,176
Interest expense	(34,682)	(27,112)	(21,359)
Other income	7,193	8,522	5,010
(Loss) income before income taxes	(185,630)	212,631	312,827
Income tax provision	(14,267)	(63,001)	(82,672)
Net (loss) income	$ (199,897)	$ 149,630	$ 230,155
Basic (loss) earnings per share	$ (4.65)	$ 3.18	$ 4.75
Diluted (loss) earnings per share	$ (4.65)	$ 3.16	$ 4.72
Operating expenses [Member]
Restructuring and integration expense	$ (71,248)	$ (19,737)	$ (8,562)
Product [Member]
Total revenue	1,409,155	1,451,833	1,469,854
Total cost of revenue	(531,307)	(547,640)	(529,638)
Service [Member]
Total revenue	599,560	546,192	495,702
Total cost of revenue	$ (281,628)	$ (244,108)	$ (213,069)