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Construction Joint Ventures - Income Statement Information (Details) - Equity Method Investment, Nonconsolidated Investee or Group of Investees - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of Equity Method Investments [Line Items]
Revenues	$ 57,918
Joint Ventures
Schedule of Equity Method Investments [Line Items]
Revenues		$ 62,489	$ 116,477	$ 111,906
Income before tax	7,567	8,780	14,344	13,415
Sterling’s noncontrolling interest:
Revenues	23,970	26,994	50,578	48,938
Income before tax	$ 2,948	$ 3,676	$ 6,015	$ 5,811

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