Consolidated Statement of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Product Information [Line Items]
Revenue	$ 802,965	$ 798,212
Costs of revenue	(623,921)	(606,378)
Gross profit	179,044	191,834
Corporate general and administrative expenses	(31,813)	(42,978)
Gains on divestitures and impairment charges, net	(4,545)	1,878
Operating income	151,776	146,978
Interest expense	(44,351)	(47,390)
Losses on early extinguishment of debt, net	(139)	0
Other income (expense), net	(1,247)	720
Income before income taxes	106,039	100,308
(Provision for) benefit from income taxes	24,038	21,095
Net income	82,001	79,213
Net income attributable to noncontrolling interests	60	(110)
Net income attributable to common stockholders	$ 81,941	$ 79,323
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.45	$ 0.44
Basic weighted average number of shares	180,854	181,696
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.45	$ 0.43
Diluted weighted average number of shares	183,585	185,317
Dividends declared per share	$ 190	$ 180
Product [Member]
Product Information [Line Items]
Revenue	$ 377,883	$ 381,209
Costs of revenue	(196,448)	(197,894)
Service [Member]
Product Information [Line Items]
Revenue	367,528	355,371
Costs of revenue	(197,524)	(190,813)
Product and Service, Other [Member]
Product Information [Line Items]
Revenue	57,554	61,632
Costs of revenue	$ (229,949)	$ (217,671)