Segment Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment			3
Revenues	$ 556,942	$ 463,449	$ 1,477,830	$ 1,180,431
Operating Income	47,686	32,031	117,045	87,506
Acquisition related costs	(277)	0	(762)	0
Operating Segments
Segment Reporting Information [Line Items]
Revenues	556,942	463,449	1,477,830	1,180,431
Operating Income	56,492	37,790	138,503	101,929
Corporate
Segment Reporting Information [Line Items]
Operating Income	(8,529)	(5,759)	(20,696)	(14,423)
E-Infrastructure Solutions Backlog \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	255,530	121,286	658,005	341,601
Operating Income	37,533	19,218	91,642	61,744
Transportation Solutions Revenues \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	221,126	249,898	573,006	600,105
Operating Income	9,635	9,334	18,428	16,796
Building Solutions Backlog - Commercial \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	80,286	92,265	246,819	238,725
Operating Income	$ 9,324	$ 9,238	$ 28,433	$ 23,389

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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