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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues $ 623,595 $ 672,230 $ 556,236
Cost of revenues (594,642) (639,809) (586,180)
Gross profit (loss) 28,953 32,421 (29,944)
General and administrative expenses (41,880) (36,897) (40,951)
Other operating (expense) income, net (1,460) 252 1,737
Operating loss (14,387) (4,224) (69,158)
Gain on sale of securities     91
Interest income 460 754 879
Interest expense (3,012) (1,123) (616)
Loss on extinguishment of debt (240)    
Loss before income taxes and earnings attributable to noncontrolling interests (17,179) (4,593) (68,804)
Income tax expense (7) (632) (1,222)
Net loss (17,186) (5,225) (70,026)
Noncontrolling owners’ interests in earnings of subsidiaries (3,216) (4,556) (3,903)
Net loss attributable to Sterling common stockholders $ (20,402) $ (9,781) $ (73,929)
Net loss per share attributable to Sterling common stockholders:      
Basic and diluted (in dollars per share) $ (2.02) $ (0.54) $ (4.91)
Weighted average number of common shares outstanding used in computing per share amounts:      
Basic and diluted (in shares) 19,375,213 18,063,466 16,635,179