Consolidated Statement of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Product Information [Line Items]
Revenue	$ 1,112,403	$ 1,077,981
Costs of revenue	(735,490)	(695,538)
Gross profit	376,913	382,443
Corporate general and administrative expenses	(41,704)	(41,669)
Gains on divestitures and impairment charges, net	489	1,266
Operating income	335,698	342,040
Interest expense	(39,028)	(35,812)
Other income (expense), net	128	341
Income before income taxes	296,798	306,569
(Provision for) benefit from income taxes	(77,231)	(77,614)
Net income	219,567	228,955
Net income attributable to noncontrolling interests	(54)	(76)
Net income attributable to common stockholders	$ 219,513	$ 228,879
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 1.36	$ 1.35
Basic weighted average number of shares	161,328	169,918
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 1.34	$ 1.33
Diluted weighted average number of shares	163,807	172,367
Dividends declared per share
Product [Member]
Product Information [Line Items]
Revenue	$ 561,547	$ 554,591
Costs of revenue	(260,051)	(251,692)
Service [Member]
Product Information [Line Items]
Revenue	480,609	463,859
Costs of revenue	(219,538)	(202,978)
Product and Service, Other [Member]
Product Information [Line Items]
Revenue	70,247	59,531
Costs of revenue	$ (255,901)	$ (240,868)