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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) [Abstract]
Revenues	$ 128,498	$ 116,865	$ 227,740	$ 203,022
Cost of revenues	114,916	104,162	206,559	182,066
Gross profit	13,582	12,703	21,181	20,956
General and administrative expenses	(6,300)	(5,241)	(12,356)	(10,708)
Other income (expense)	5	(83)	150	(52)
Operating income	7,287	7,379	8,975	10,196
Gain (loss) on sale of securities and other	(41)	547	(245)	964
Interest income	565	483	943	685
Interest expense	(374)	(297)	(588)	(594)
Income before income taxes and earnings attributable to noncontrolling interests	7,437	8,112	9,085	11,251
Income tax expense	(1,145)	(2,263)	(1,311)	(3,121)
Net income	6,292	5,849	7,774	8,130
Noncontrolling owners' interests in earnings of subsidiaries and joint ventures	(2,081)	(1,182)	(3,519)	(1,911)
Net income attributable to Sterling common stockholders	$ 4,211	$ 4,667	$ 4,255	$ 6,219
Net income per share attributable to Sterling common stockholders:
Basic (in dollars per share)	$ 0.26	$ 0.29	$ 0.26	$ 0.39
Diluted (in dollars per share)	$ 0.25	$ 0.28	$ 0.26	$ 0.38
Weighted average number of common shares outstanding used in computing per share amounts:
Basic (in shares)	16,483,691	16,119,234	16,474,074	16,106,786
Diluted (in shares)	16,594,509	16,542,667	16,604,368	16,540,081

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