Business Segments (Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenue	$ 1,207,595	$ 1,250,729
Income (loss) from construction operations	49,704	47,227
Capital expenditures	9,835	11,693
Depreciation and amortization	26,874	22,811
Operating Segments
Segment Reporting Information [Line Items]
Revenue	1,365,262	1,367,621
Income (loss) from construction operations	62,645	57,916
Capital expenditures	9,782	11,677
Depreciation and amortization	24,104	20,036
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(157,667)	(116,892)
Corporate
Segment Reporting Information [Line Items]
Revenue	0
Income (loss) from construction operations	(12,941)	(10,689)
Capital expenditures	53	16
Depreciation and amortization	2,770	2,775
Civil
Segment Reporting Information [Line Items]
Revenue	475,575	486,629
Civil \| Operating Segments
Segment Reporting Information [Line Items]
Revenue	583,144	580,087
Income (loss) from construction operations	50,105	46,121
Capital expenditures	9,564	11,192
Depreciation and amortization	22,713	18,616
Civil \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(107,569)	(93,458)
Building
Segment Reporting Information [Line Items]
Revenue	407,233	481,764
Building \| Operating Segments
Segment Reporting Information [Line Items]
Revenue	457,170	505,082
Income (loss) from construction operations	11,216	3,516
Capital expenditures	73	12
Depreciation and amortization	432	427
Building \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(49,937)	(23,318)
Specialty Contractors
Segment Reporting Information [Line Items]
Revenue	324,787	282,336
Specialty Contractors \| Operating Segments
Segment Reporting Information [Line Items]
Revenue	324,948	282,452
Income (loss) from construction operations	1,324	8,279
Capital expenditures	145	473
Depreciation and amortization	959	993
Specialty Contractors \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	$ (161)	$ (116)

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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