Revenue (Schedule Of Revenue By Contract Type) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
REVENUE	$ 4,641,830	$ 5,318,763	$ 4,450,832
Fixed price
Disaggregation of Revenue [Line Items]
REVENUE	3,140,148	3,312,393	2,646,436
Guaranteed maximum price
Disaggregation of Revenue [Line Items]
REVENUE	905,704	1,154,028	780,352
Unit price
Disaggregation of Revenue [Line Items]
REVENUE	363,786	476,672	539,881
Cost plus fee and other
Disaggregation of Revenue [Line Items]
REVENUE	232,192	375,670	484,163
Civil
Disaggregation of Revenue [Line Items]
REVENUE	2,095,760	2,199,899	1,779,352
Civil | Fixed price
Disaggregation of Revenue [Line Items]
REVENUE	1,815,079	1,792,765	1,315,195
Civil | Guaranteed maximum price
Disaggregation of Revenue [Line Items]
REVENUE	2,854	1,829	6,951
Civil | Unit price
Disaggregation of Revenue [Line Items]
REVENUE	268,377	392,548	436,015
Civil | Cost plus fee and other
Disaggregation of Revenue [Line Items]
REVENUE	9,450	12,757	21,191
Building
Disaggregation of Revenue [Line Items]
REVENUE	1,428,102	1,984,641	1,742,040
Building | Fixed price
Disaggregation of Revenue [Line Items]
REVENUE	336,128	508,655	561,831
Building | Guaranteed maximum price
Disaggregation of Revenue [Line Items]
REVENUE	888,345	1,136,782	752,110
Building | Unit price
Disaggregation of Revenue [Line Items]
REVENUE	(1,373)	867	12,063
Building | Cost plus fee and other
Disaggregation of Revenue [Line Items]
REVENUE	205,002	338,337	416,036
Specialty Contractors
Disaggregation of Revenue [Line Items]
REVENUE	1,117,968	1,134,223	929,440
Specialty Contractors | Fixed price
Disaggregation of Revenue [Line Items]
REVENUE	988,941	1,010,973	769,410
Specialty Contractors | Guaranteed maximum price
Disaggregation of Revenue [Line Items]
REVENUE	14,505	15,417	21,291
Specialty Contractors | Unit price
Disaggregation of Revenue [Line Items]
REVENUE	96,782	83,257	91,803
Specialty Contractors | Cost plus fee and other
Disaggregation of Revenue [Line Items]
REVENUE	$ 17,740	$ 24,576	$ 46,936