CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total revenue	$ 493,986	$ 488,244	$ 993,051	$ 980,158
Total cost of revenue	(202,528)	(190,201)	(402,151)	(378,959)
Gross profit	291,458	298,043	590,900	601,199
Selling, general and administrative expense	(222,292)	(209,585)	(452,469)	(420,739)
Restructuring and integration expense	(17,497)	(6,371)	(23,780)	(8,693)
Asset impairment charges	0	0	0	(2,149)
Operating income	51,824	82,823	115,597	170,531
Interest expense	(9,239)	(6,130)	(18,540)	(11,708)
Other income	2,168	2,436	3,934	3,724
Income before income taxes	44,753	79,129	100,991	162,547
Income tax provision	(12,171)	(18,922)	(27,219)	(39,003)
Net income	32,582	60,207	73,772	123,544
Comprehensive income	$ 33,744	$ 57,272	$ 76,824	$ 118,838
Basic earnings per share	$ 0.75	$ 1.26	$ 1.68	$ 2.58
Diluted earnings per share	$ 0.75	$ 1.25	$ 1.68	$ 2.56
Operating expenses [Member]
Restructuring and integration expense	$ (17,342)	$ (5,635)	$ (22,834)	$ (7,780)
Product [Member]
Total revenue	347,061	359,935	697,580	723,342
Total cost of revenue	(133,798)	(134,332)	(265,061)	(267,703)
Service [Member]
Total revenue	146,925	128,309	295,471	256,816
Total cost of revenue	$ (68,730)	$ (55,869)	$ (137,090)	$ (111,256)