Consolidated Statement of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Product Information [Line Items]
Revenue	$ 820,035	$ 812,572	$ 1,623,000	$ 1,610,784
Costs of revenue	(601,268)	(621,426)	(1,225,189)	(1,227,804)
Gross profit	218,767	191,146	397,811	382,980
Corporate general and administrative expenses	(37,169)	(29,218)	(68,982)	(72,196)
Gains on divestitures and impairment charges, net	(737)	11,823	(5,282)	13,701
Operating income	182,335	150,105	334,111	297,083
Interest expense	(41,767)	(47,317)	(86,118)	(94,707)
Losses on early extinguishment of debt, net	(11)	(7,579)	(150)	(7,579)
Other income (expense), net	1,166	874	(81)	1,594
Income before income taxes	141,723	96,083	247,762	196,391
(Provision for) benefit from income taxes	36,170	23,570	60,208	44,665
Net income	105,553	72,513	187,554	151,726
Net income attributable to noncontrolling interests	45	184	105	74
Net income attributable to common stockholders	$ 105,508	$ 72,329	$ 187,449	$ 151,652
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.59	$ 0.40	$ 1.04	$ 0.83
Basic weighted average number of shares	177,902	182,369	179,378	182,048
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.59	$ 0.39	$ 1.03	$ 0.82
Diluted weighted average number of shares	179,666	185,690	181,639	185,517
Dividends declared per share	$ 190	$ 180
Product [Member]
Product Information [Line Items]
Revenue	$ 414,596	$ 415,492	$ 792,479	$ 796,701
Costs of revenue	(207,102)	(213,635)	(403,550)	(411,529)
Service [Member]
Product Information [Line Items]
Revenue	354,799	339,090	722,327	694,461
Costs of revenue	(173,515)	(193,378)	(371,039)	(384,191)
Product and Service, Other [Member]
Product Information [Line Items]
Revenue	50,640	57,990	108,194	119,622
Costs of revenue	$ (220,651)	$ (214,413)	$ (450,600)	$ (432,084)