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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 42,904	$ 40,695	$ 29,540
Change in interest rate swap, net of tax (Note 10)	(5,055)	(209)	0
Total comprehensive income	37,849	40,486	29,540
Less: Net income attributable to noncontrolling interests	(598)	(794)	(4,353)
Comprehensive income attributable to Sterling common stockholders	$ 37,251	$ 39,692	$ 25,187

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