The following tables disaggregate revenue by end market, customer type and contract type, which the Company believes best depict how the nature, amount, timing and uncertainty of its revenue and cash flows are affected by economic factors for the three and six months ended June 30, 2020 and 2019.



	Three Months Ended				Six Months Ended
	June 30,				June 30,
(in thousands)	2020		2019		2020		2019
Civil segment revenue by end market:
Mass transit (includes transportation and tunneling projects)	$	354,809	$	243,620	$	651,952	$	389,870
Bridges		89,100		86,467		141,284		155,774
Highways		35,591		60,244		68,173		101,287
Military defense facilities		35,042		13,140		58,652		23,421
Water		29,548		4,658		53,292		14,326
Other		24,886		65,529		82,252		122,474
Total Civil segment revenue	$	568,976	$	473,658	$	1,055,605	$	807,152



	Three Months Ended				Six Months Ended
	June 30,				June 30,
(in thousands)	2020		2019		2020		2019
Building segment revenue by end market:
Commercial and industrial facilities	$	106,899	$	115,193	$	239,948	$	224,546
Hospitality and gaming		107,942		53,576		226,929		122,885
Municipal and government		79,223		68,580		148,725		130,542
Mass transit (includes transportation projects)		66,552		41,211		124,399		70,388
Education facilities		47,038		47,062		78,660		89,590
Health care facilities		32,418		60,796		68,307		141,023
Mixed use		13,101		9,316		23,073		24,591
Other		19,848		32,584		44,744		58,219
Total Building segment revenue	$	473,021	$	428,318	$	954,785	$	861,784



	Three Months Ended				Six Months Ended
	June 30,				June 30,
(in thousands)	2020		2019		2020		2019
Specialty Contractors segment revenue by end market:
Mass transit (includes transportation and tunneling projects)	$	118,634	$	100,016	$	267,305	$	181,411
Commercial and industrial facilities		20,499		43,618		74,004		87,641
Multi-unit residential		37,611		19,225		64,104		30,614
Education facilities		10,338		14,036		26,895		25,616
Mixed use		10,536		18,036		24,338		28,705
Health care facilities		4,283		9,248		6,805		20,899
Other		32,529		19,120		53,315		39,940
Total Specialty Contractors segment revenue	$	234,430	$	223,299	$	516,766	$	414,826



	Three Months Ended June 30, 2020								Three Months Ended June 30, 2019
					Specialty								Specialty
(in thousands)	Civil		Building		Contractors		Total		Civil		Building		Contractors		Total
Revenue by customer type:
State and local agencies	$	503,828	$	157,748	$	113,623	$	775,199	$	381,438	$	133,798	$	114,255	$	629,491
Federal agencies		42,590		34,648		11,292		88,530		26,979		44,396		2,761		74,136
Private owners		22,558		280,625		109,515		412,698		65,241		250,124		106,283		421,648
Total revenue	$	568,976	$	473,021	$	234,430	$	1,276,427	$	473,658	$	428,318	$	223,299	$	1,125,275



	Six Months Ended June 30, 2020								Six Months Ended June 30, 2019
					Specialty								Specialty
(in thousands)	Civil		Building		Contractors		Total		Civil		Building		Contractors		Total
Revenue by customer type:
State and local agencies	$	899,873	$	303,764	$	246,496	$	1,450,133	$	638,545	$	278,484	$	211,326	$	1,128,355
Federal agencies		79,251		66,621		21,048		166,920		50,137		84,547		10,530		145,214
Private owners		76,481		584,400		249,222		910,103		118,470		498,753		192,970		810,193
Total revenue	$	1,055,605	$	954,785	$	516,766	$	2,527,156	$	807,152	$	861,784	$	414,826	$	2,083,762



	Three Months Ended June 30, 2020								Three Months Ended June 30, 2019
					Specialty								Specialty
(in thousands)	Civil		Building		Contractors		Total		Civil		Building		Contractors		Total
Revenue by contract type:
Fixed price	$	455,928	$	114,229	$	205,531	$	775,688	$	349,945	$	136,250	$	187,826	$	674,021
Guaranteed maximum price		281		248,738		4,038		253,057		1,644		185,050		7,315		194,009
Unit price		111,790		629		18,442		130,861		116,285		2,800		20,183		139,268
Cost plus fee and other		977		109,425		6,419		116,821		5,784		104,218		7,975		117,977
Total revenue	$	568,976	$	473,021	$	234,430	$	1,276,427	$	473,658	$	428,318	$	223,299	$	1,125,275



	Six Months Ended June 30, 2020								Six Months Ended June 30, 2019
					Specialty								Specialty
(in thousands)	Civil		Building		Contractors		Total		Civil		Building		Contractors		Total
Revenue by contract type:
Fixed price	$	864,899	$	219,827	$	454,047	$	1,538,773	$	592,811	$	250,609	$	343,090	$	1,186,510
Guaranteed maximum price		589		486,511		6,587		493,687		3,878		392,182		10,921		406,981
Unit price		183,148		1,163		39,593		223,904		201,163		8,028		39,186		248,377
Cost plus fee and other		6,969		247,284		16,539		270,792		9,300		210,965		21,629		241,894
Total revenue	$	1,055,605	$	954,785	$	516,766	$	2,527,156	$	807,152	$	861,784	$	414,826	$	2,083,762

Changes to the total estimated contract revenue or cost for a given project, either due to unexpected events or revisions to management’s initial estimates, are recognized in the period in which they are determined. Revenue was negatively impacted during the three- and six-month periods ended June 30, 2020 related to performance obligations satisfied (or partially satisfied) in prior periods by $19.8 million and $35.6 million, respectively. Likewise, revenue was negatively impacted during the three- and six-month periods ended June 30, 2019 related to performance obligations satisfied (or partially satisfied) in prior periods by $14.6 million and $27.7 million, respectively.

Remaining performance obligations represent the transaction price of firm orders for which work has not been performed and exclude unexercised contract options. As of June 30, 2020, the aggregate amounts of the transaction prices allocated to the remaining performance obligations of the Company’s construction contracts were $5.1 billion, $1.7 billion and $2.2 billion for the Civil, Building and Specialty Contractors segments, respectively. As of June 30, 2019, the aggregate amounts of the transaction prices allocated to the remaining performance obligations of the Company’s construction contracts were $5.5 billion, $1.7 billion and $2.2 billion for the Civil, Building and Specialty Contractors segments, respectively. The Company typically recognizes revenue on Civil segment projects over a period of three to five years, whereas for projects in the Building and Specialty Contractors segments, the Company typically recognizes revenue over a period of one to three years.