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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 21,757	$ 15,397	$ 53,642	$ 36,877
Other comprehensive income, net of tax
Change in interest rate swap, net of tax	718	1,010	2,341	(6,104)
Total comprehensive income	22,475	16,407	55,983	30,773
Less: Comprehensive income attributable to noncontrolling interests	(631)	(240)	(1,905)	(395)
Comprehensive income attributable to Sterling common stockholders	$ 21,844	$ 16,167	$ 54,078	$ 30,378

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