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Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 2,703,581	$ 2,764,095
Operating income (loss)	113,729	80,737
Depreciation	62,107	54,410
Corporate and Non-Allocated Costs
Segment Reporting Information [Line Items]
Operating income (loss)	(94,119)	(79,298)
Depreciation	4,375	4,162
Electric Power Infrastructure Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,060,120	1,767,027
Operating income (loss)	199,035	128,758
Depreciation	36,645	28,713
Underground Utility and Infrastructure Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	643,461	997,068
Operating income (loss)	8,813	31,277
Depreciation	$ 21,087	$ 21,535

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