CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenue	$ 3,974,988	$ 3,866,956	$ 3,598,484
Cost of revenue	3,035,003	2,791,414	2,513,857
Selling, general and administrative	576,568	513,526	510,075
Impairment and related charges	0	0	81,112
Operating income	363,417	562,016	493,440
Other (expense) income:
Interest expense, net	(156,391)	(157,017)	(153,925)
Loss on extinguishment of debt	0	(633)	(1,012)
Joint venture equity income	2,044	2,556	2,580
Other, net	(9,432)	(8,509)	36,530
Total other expense, net	(163,779)	(163,603)	(115,827)
Income from continuing operations before income taxes	199,638	398,413	377,613
Provision for income taxes	35,326	57,492	128,037
Income from continuing operations	164,312	340,921	249,576
(Loss) Income from discontinued operations, net of tax	(1,766)	1,739	(1,932)
Net income	162,546	342,660	247,644
Net income attributable to noncontrolling interests	3,954	5,129	5,113
Net income attributable to common stockholders	$ 158,592	$ 337,531	$ 242,531
Basic net income per share attributable to common stockholders:
Income from continuing operations (in dollars per share)	$ 0.58	$ 1.22	$ 0.88
(Loss) income from discontinued operations (in dollars per share)	(0.01)	0.01	(0.01)
Net income per common share (in dollars per share)	0.57	1.23	0.87
Diluted net income per share attributable to common stockholders:
Income from continuing operations (in dollars per share)	0.58	1.21	0.88
(Loss) income from discontinued operations (in dollars per share)	(0.01)	0.01	(0.01)
Net income per common share (in dollars per share)	$ 0.57	$ 1.22	$ 0.87
Weighted-average common shares outstanding:
Basic (in shares)	274,168	275,235	276,893
Diluted (in shares)	276,217	277,518	278,320
Dividend per common share (in dollars per share)	$ 0.56	$ 0.56	$ 0.56