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Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 2,506,231	$ 2,839,199	$ 5,270,326	$ 5,646,458
Operating income (loss)	112,916	78,580	193,653	198,067
Depreciation	54,526	53,811	108,936	106,027
Corporate and Non-Allocated Costs
Segment Reporting Information [Line Items]
Operating income (loss)	(92,230)	(84,298)	(171,528)	(167,127)
Depreciation	4,107	4,363	8,269	8,773
Electric Power Infrastructure Services | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,792,918	1,734,336	3,559,945	3,398,359
Operating income (loss)	183,896	92,935	312,654	254,552
Depreciation	28,987	26,714	57,700	51,965
Pipeline and Industrial Infrastructure Services Division | Operating Segments
Segment Reporting Information [Line Items]
Revenues	713,313	1,104,863	1,710,381	2,248,099
Operating income (loss)	21,250	69,943	52,527	110,642
Depreciation	$ 21,432	$ 22,734	$ 42,967	$ 45,289

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